Buy ins?

[Ender1553]

I see this everywhere you try to look about staying within your bankroll... buy in no more than x percentage of your roll.

What is it for no-limit? Best I can tell from running the numbers is 100x the big blind. So, if you're playing at a .05/.10 table, you should sit down with $10. Is this only true for 6 man, or is this for 6 and 9/10? Am I off?

It made sense on Absolute poker b/c the min you could come to the table with was $4 and the max $20, but at Ultimate bet its $2 and $10...?

All the advice says my bank roll should be about 20x the buy in (but never says the buy in). With my above logic, in order to really play at the .05/.10 tables on absolute (the smallest), I should sit with $10 and should have a roll of ~$200...?

Help anyone?