Hey all- I'm changing up my rig again and I think I'm going for separate preamp/power amp. A guy in my area has a Demeter preamp and a Stewart World 1.2 power amp going into an Epifani 310 cab. It is the sweetest sound for slap I've ever heard. How much does the power amp have to do with the final tone? What should I look for in a power amp aside for power? Any recommendations? I like the stewart world 1.2 but it is out of production and doesn't come up all that often on ebay... Just looking for opinions. I'm sure there are plenty of them here.