You can't play with a stack that's too small relative to the size of the big blind, or you're not getting paid off enough when you get a hand relative to what it costs you to see 10 hands at the table. Probably 12-15 dollars sounds right for the 50 dollar NL tables....whether a $12 dollar all-in there is called as easily as a $6 raise in the $25 room remains to be seen.

Great question about limping vs. raising UTG with this system....but if you limp and they just call you have to see a flop...and then you're actually playing POKER, God forbid