There's nothing wrong with the dobeck though, you'll find some BIG shooters that are using the dobeck still..
VelociRaptor from RaptorForum (Built my engine) He's running one.
SandDragon - Member on here. He has a 727, 8" swinger, and running Nitros...... All on a Dobeck.
Any way you go, value doesn't really depreciate on these things. I think the cheapest I seen a PCIII go for was $200+shipping. Which you're basically @ the price of new.