I've been playing out of a big 'ol tube head for about a year. However, as of late, the weight has been an issue (80 lbs). I'm just getting tired I guess. I started looking at my solid state options. I play mainly rock - just fingerstyle. I immediately checked out ampeg and the whole svt series. I looked at the svt-3, 4, and 5. I also checked out the ashdown series as well. I've done a bunch of searches here at TB, but I've also been noticing a lot of info on rack units as well (separate pre/power). Is there really a difference between "bass amp heads" and separate power and preamps? If not, for example: I've checked out the svt-3 pro amp. It's rated 450 watts @ 4 ohms. However, it costs, new, around 700! I've looked at power amps (crown, plx, etc.) that are rated wattage wise a lot higher. If you could get a preamp (svp-pro or rbi)and a separate power amp, wouldn't you have a better rig for about the same price, or possibly cheaper? Is this some bass marketing secret/scam? If I go SS, I can't see getting a "bass head". I would rather piece it. Thoughts?