For me, it's not about table selection as much as it is "seat" selection. I like to isolate weak players with raises so I specifically look to sit to the immediate left of people seeing half the flops and not raising enough preflop. If I've got a table with two donkeys and they're to MY LEFT with 3 tight-aggressive players between us I'm not in a good situation.
I also strictly play Party Poker. Bottom line:
More tables equals more fish and more opportunity to find the perfect spot. I never, EVER settle for a mediocre table at Party. With PokerAce, I open up tables and join individual waitlists. I've also got a buddy list of over 500 players, some of whom still play 5/10. I pick on them a bit too. By the time a seat opens up, I have a good read on the table and I can determine if it is profittable quickly.
Wouldn't it suck to be some unknowing donkey just having fun; meanwhile, you end up on someone's "list" and they practically stalk you to take your money?