The amp would work well and be loud as heck for guitar. For bass you'd be better off with them as heads as the open back combo cabs (and guitar speakers) wont do you much good. I wouldn't worry too much about the mods, they sound like they'd be easily reversible if you wanted. The eminence speakers would likely be original, the oxfords definitely not. As far as value, the combos usually go for close to the same price as the V4 heads. They're basically the same amp, but the combos don't seem to be as popular. Or just don't come up for sale as often. Not sure what you're selling your rhodes for, but I think a VT-22 usually sells for around $5-700.