Finding a good table is trickier than you think.
First of all it must not have more than 2 other short stacks, so that you will either be the third one, or replace a third short stack. Any more of them, and the table is already -EV as shorties don't call your pre-flop raises unless with AA/KK/QQ or AK. The big stacks usually aren't idiots either and will notice that shorties only play strong hands, so a raise from a 2 dollar guy often results in everybody else folding and you just getting the blinds and the odd limper.
[EDIT2]: Forgot another important point. Make sure you don't end up sitting between two other short/medium stacks, so that there would be 3 in a row. That's every blind stealer's dream, trust me.
Second it must have an Average Pot. Tables with $0 AP's are too tight and you again end up only getting the blinds with your raises. But any table with $2+ AP will attract German and Russian $2 TAG's like vultures. It's unbelievable how often you see $3+ AP tables with 6+ short stacks in the wait list.
Average Hands per Hour is another factor to consider. Tables with a low number are naturally rather slow, which could indicate that players actually think before they act. Or it's full of multi-tablers who don't pay attention at all.

Tables with a high number either have maniacs, or rocks again who throw away anything but aces and kings. Best thing to do here is watch the other players while you play, and note down the fishes. I myself add particularly loose fishes to my Buddy List and try to sit down at their tables, regardless of the previously mentioned factors, except the amount of shorties.
Overall, it's easier to find good tables in the (European) evenings for platforms who don't allow US players, or early (European) mornings (7-8 AM) for platforms who do let US players join. The later in the evening it is for your opponents, the more exhausted they usually are and are prone to make more mistakes.
That's all I have to share about table selection. Hope it helps.
[EDIT]: Btw, $10+ stacks on NL10 are big stacks. The 10 is the highest amount you can sit down with at the table. On NL25, you can take 25 dollars, on NL50 50 dollars, etc. So look at the limit, and then at the players' stacks, and you'll know who the big/medium/short stacks are.