playing against a super-maniac

I almost exclusively play heads up at pp and have been a consistent winner at the 3-6 level for the last 8 months.(about 2000-3000 a month) I seem to have the most trouble against very aggresive opponents. I understand that with these types of players your swings are going to be larger but my question is how to play these opponents. Should I play back at them just as aggresively or tighten up and play better hands and check-call more. These are very aggresive opponents who arent afraid t raise and reraise the turn with nothing after i raise the preflop and theirs A K on the flop. So what is the best way to play these guys.


Also I thinking of moving up to 5-10. How tdo the games compare to the 3-6 level and what do you guys think a good banlroll would be.


Thanks in advance


Billybob