Ive actually been working on a 4e priority system. However, ive been baseing it on 3e's old priority system.
I loved the priority system personally; I understand it's not for everyone, but it worked really well for me. (BTW, for those who don't like it, what were your reasons?) If i had any problems with it, i admit the resource jump was the worst(1,000,000 to 400,000 to 90,000 were pretty large jumps, as opposed to the much more reasonable jumps of attributes and skills. The million back in the day existed for deckers its pretty much known, and riggers to a lesser extent, but that was more a problem with the resource allocation rather than the priority system in itself.)
Anyway, so far im in the beginnings of it, and this is what ive come up with. I started with Attributes.
In the old system, the Attributes ran 30/27/24/21/18.
Attributes priority A, if you averaged it, could net you 5's down the line, if you were human(you could allocate 5 points to each attribute.)
Nowadays, 4 is what the old 5 was about. So, 4's right down the line can be allocated. With 8 attributes, if everything starts at 1, you get 24 points, if it starts at 0, you get 32 points. Pretty simple. Im keeping the limits of one 6/max level score at chargen, and making it so the final point costs 2 attribute points(since the last points in the BP system cost 25, or 2.5x10, i just rounded down.) So, assuming the attributes start at 0(again, not sure if i leave them at 1 yet), it's 5 points to hit a 5, and 2 more(for 7), to hit a 6. Seems balanced to me at first glance.
Priority B, or the old 27 points, allowed a human average of 4/4/4/5/5/5.
Under the new rules? This works out well for 3/3/3/3/4/4/4/4. 28 points.
C, 24 points, or 4/4/4/4/4/4 average? 3/3/3/3/3/3/3/3. Which, again, is...24 points(starting from 0).
D, which was 21 before(3/3/3/4/4/4), i adjusted to average 2/2/2/3/3/3/3/3.
And so on. I don't have all the info here, but so far it's looking good. The most difficult part was coming up with a magic system. Since you add to your magic attribute, and also have Edge, which in the BP system don't count toward your raw attribute limit, i made a 6th priority, for ''special attributes'', in which you divide up between Magic and Edge. To balance out the fact that you only start with a 1 magic and must add to it, Full Magicians are priority B, and i reintroduced Aspected Magicians and Adepts in priority C.
I dont have in front of me anything, but with the Special Attribute priority(Edge and Magic starting at one and humans getting +1 edge), i was figuring out a good number to give. 7 points for priority A seems like a good amount; a human could max their magic(total 6 points, 4 to bring it to 5 and 2 more for 6), as well as have one extra Edge point(hey, the first priority SHOULD give something decent.). Mr. Lucky could essentially max out with this(the Lucky edge extending the max to

. Again, this is still in the making.
Didn't want to threadjack, just wanted to input something if you wanted the 'old-school'' feel. Ill probably post this whole system when i tweak it up. the Skills are a bit challenging at the moment.