I use GEB-7 EQ for guitar and it works great. It's cheaper than the guitar one too. I've never tried any other bass effects, but who knows it might sound good. Let us know.
CE-2B sounds very good for guitar too, I haven�t tested back to back with CE-2, but I have used CE-2B with guitar many times and I like it a lot. The good thing is that CE-2B usually sells for less money than CE-2. Maybe Dr Bob, or anybody else used to schematics could check the schematics for the electronically differences.
It's a good price but you already got the CE-2 so you there's a chance that the CE-2B will end up on the shelf anyway. If you're not already collecting it could mean that you just started