Good logic guys. Don't go too far too early, it's a marathon, not a sprint. That goes for multitabling too, if you are doing 6 comfortably, that doesn't mean you should do 12 right away.
Jimmy- Those breakeven regs are actually really easy to play against, and you don't really mind those types in your games. It's getting pretty hard to table select away from tables with loads of regs. Those players usually have glaring leaks. The main one i see from those guys is playing too many tables and playing a very formulaic approach. Usuallly they are just grinding for the bonuses and such, so to have them on your table shouldn't bother you too much, as long as you are looking for their weaknesses and adjusting properly.
Apart from a few other differances which i don't really have the time to get into right now. The mid-stakes fish play a little differantly. In the lower limits, the fish actually tend to be usually people who are actively trying to improve their game, whereas the mid to higher limits, the fish tend to be guys with pockets full of money and splash it around the table simply becasue they don't care.
For those of you who think this game is dying, and the fish will dry up soon, I've been sharkscoping literally thousands of players and the results are making me think the games won't dry up for a long time yet.