Thanks everyone for the replies! There seems to be a ton of great options out there and I wish I could go out and test them all! I am running just the power amp until I decide on a preamp, and it actually sounds pretty good! I desperately need some gain to get the volume up, even with the input sensitivity set high on the Crown XLS1002. The DSP is really handy, as I was able to put a bandpass filter on my newly acquired ADA Bassline 15 and limit between 30hz and 200hz. This helped the cab from farting out on the low B of my 5-string, and sounds much better as the mids sound very muddy through that cab.
I am considering the Presonus Studio Channel, as I hear it's very clean and has a good DI, but with a tube swap I can get a little more versatility in its sound. It really is difficult to make a choice without playing through it first, and knowing that if I decide to sell, it's much harder than a pedal, I assume!