Gah! I mistook the Troll. Yeah, it's -1 Agl, Log, Intuition, and Agility, -2 Charisma. +4 Body, +4 Strength. +2 total...but with +1 Reach, +1 Dermal Armor, and Natural Thermographic vision. Cost: 40 BP.
How are the Shifter stats off? The bear does have some hefty trades for his +6 Body/Strength, Enhanced Smell, +1 Reach and Natural Armor(latter in Bear Form only and tough to use on a run if they are on a running team since they are so huge), being -2 Agl, -1 Reaction, Logic, Intuition, and Willpower, along with the tasty Silver Allergy(Severe), Vulnerability(Silver), and Uneducated that all shifters come with, at the cost of 80 BPs.
Hmm...if anything, the bears get the short end of the stick. +6 Strength(Str being looked at as one of the most useless stats in the game by the average SR player) probably isn't the selling point to a bear, and hell, even TrollBowBear, again, without significant Adept Power increases in his active skill(his Agility being capped at forever 4 unless he takes Exceptional Attribute for 20 BP/40 Karma), is going to have maybe half the dice that CyberHeavyMachineGunIHaveATonOfAgilityAndASmartlink Ork.
Looking at the other shifters: Foxes are -1 Body, -2 Strength and -1 Reach in animal form, but +1 Agl, Rea, and Intuition, enhanced hearing, low-light vision, smell AND taste. Fox form is also much more viable to use in a cramped area, for a cost of 50 BP. Getting bonuses to things that add to Initative and every combat roll...yeah. The Body minus can be offset, as can the Str minus with little trouble. As a gunner, these would be hell on wheels. (hell, enough Martial Arts DV bonuses/critical strikes, that little Str 3 Fox Demon will go nine-tails on someone's ass in a hardcore way.)
Wolves are totally even-normal, at 55 BPs, with the addition of enhanced hearing, low-light vision, smell, and taste. 55 BP might be a bit much for these guys, IMO. The senses are nice, but they get the same drawbacks as anyone else. They do get their natural attack form, at least. I would say 40, unless the BP cost is for a rarity thing.
At 60 we have the Eagle. Whoooo. NO minuses, +1 Charisma, +2 Willpower, Vision Enhancement 2, Vision Magnification. Oh, yeah, they can
fly. 60 BPs. IMO, I would say Eagle should be worth the 80 instead of Bear.
Leopard/Jaguar is up next, at 65. +2 Body, +4(!!) Agility, +1 Reaction, +1 Strength, -1 Charisma, Int, Log, and Willpower. Enhanced vision: Hearing, Low-Light, Vision, and Smell. These guys are LESS than Bear? +4 Agility is huge, IMO. Not to mention a running rate that makes some street vehicles scared. Ok, I'd maybe stick Eagle at 75, and THESE guys at 80.
Okies, now we have the cute and cuddly Seal. +3 Body, +3 Agility, +1 Strength, -1 Willpower, Low Light Vision. These guys are 70. They have that disadvantage of being rather crappy on land, however, in their animal form, and I'm guessing their animal attack is less than impressive(well, that tail with their little Strength bonus can hurt, I suppose.) Still, their stat bonuses are pretty big, and I would say Seal is worth it's BP cost, even with that little ''disadvantage''. They can always go home to their indoor swimming pool after a run.

75 is the mighty Tiger and Lion. +3 Body, +4 Agility, +1 Reaction, +2 Strength, -1 Intuition, Logic, and Willpower. Animal form has +1 Reach and enhanced hearing, low-light AND smell. I'd say these guys are worth 75.
And above, we have the humble Bear. IMO, again, Bear gets the short end of the stick. I'd say Fox is appropriately priced, Wolf could stand to be cheaper, though. Eagle and Jaguar/Leopard could stand to be a bit more expensive for what they get, Seal and Tiger/Lion are good. I'd say Bear could stand to be cheaper.
Now, I'm not sure if there is like ''a solid method'' here. I like the idea of the ''even +/-'' thing, though Tiger and Lion don't have that(they are +7 overall, with the extra bonuses), Seals are +6 as well as Bears. I'm not sure all the attributes are equal, though...and I guess that's been discussed before. Are the attributes that are chosen taken into consideration? Eagle spellcasters can be pretty scary, and any of the big cats would be the ultimate combat monkey with that agility boost(it's equal to Level 4 Muscle Toner. They don't even need ware).
So the ''six-point'' range, I'm guessing is that all of the positives are balanced out by the negatives that equal 6 points, correct? If so, Bear and Seal are kosher; so is Jaguar for that matter, though +4 Agility is a biggie. Tiger/Lion are +7, however.
But I DO overall like the shifter rules a LOT, and I'm having a blast fiddling with my elven Panzerbjorn(I can see a lot of RP opportunities coming up with this guy. For the record, I had plenty of points to do what I wanted to with him even with Bear's cost as is.) I just have a few minor quibbles about the pricing(again, I'd lower Wolf, lower Bear, increase the big cats and Eagle. Seal and Fox I think are well where they are.)