bank roll for multi-tabling SNGs

[pittsburgh_kid]

Sorry about my other post (re: making money at SNGs); once I spotted the very long thread on the same topic, I felt stupid.

But, indulge me:
How many tables do you usually play?
How big a BR do you need to multi-table SNGs?
Would you recommend starting at the $5, or playing the $20?

Single-tabling the $10, I've been consistently making money, and my (very) few forays at the $20 have been good, but maybe if I multi-table I should play the $5 for a while?

I only started playing SNGs a month ago.