I'll find the hand and post it here in a second. I feel kind of embarrassed about it but what can you do.
In the mean time, here's a chart
http://www.rustybrooks.com/tmp/chart.png
Note that if you think you can win 2bb/100 your BR requirements can be muuuuuch lower (around 160bb in the chart, compared to 350bb for 1bb/100). So if you're killing 1/2 take a shot at 2/4 with 150-200bb but be prepared to fall back.
Also note that going below the minimums is done at your own peril, as you can see the ROR shoots up dramatically with small decreases in bankroll.
And SG is right, IF you are disciplined and call fall back whenever you lose too much, you won't go broke unless you fall back to the minimum and can't go any further.
And also I think it's wrong to think "I have this many $, so I play at 1/2" - play at a range around your main number. I'm mostly playing 1/2 at this point but also some .5/1, some .25/.5 if there's no good games higher. Haven't dabbled in 2/4 yet, my bankroll is still only at about $500.