See, the thing of it is, this is such a subjective topic. One person's "Super-elite" is another person's n00b. (or b00b, if you prefer

)
My advice is, just make your best guess. Decide how fast you want them to progress, try to figure how much karma that'd take, and make your best guess. I suppose it's probably better to err on the conservative side and give them less and increase if necessary. Players like to get more karma. They very rarely enjoy getting less. But in either case, be up front with your players and just remind them that you're all learning a new game, and karma awards may change.
I would also recommend that you talk to your players and make sure you have a concensus (or at least an understanding) of how fast they will be advancing, roughly speaking. If you're expecting them to go from gritty street punks to successful gritty street punks, but one player is expecting to go from gritty street punk to uber-elite-hyper-god-of-the-shadows, then (no matter how unrealistic his expectations) there will be surprise and badness there.
Sorry I'm not giving any concrete numbers or anything, I just don't feel like I can. Maybe if you want to give us a more extended description of how fast you want them to advance (i.e. the level of ability you percieve a 400bp character to have vs your perception of an advanced character and how many runs & how much time this will entail) then we can try to give you estimates of how much karma that would take, but more likely than not you'll just get flamed by people telling you how wrong your perceptions are of what a starting character vs. an experienced character is capable of. Even so, there's bound to be a few people who agree with you, so as long as you're expecting it you should be able to get something out of it.