Three amps to choose from

I have a possible trade situation where my choices are between: An Aguilar TH500, GK Fusion, or GK MB 800. I'll be playing pick and finger style, no slap. Bass is a heavily modified Epi EB-0 with Chromes, and ideally a P or PJ at some point in the future. Sold off my entire rig and I'm rebuilding so no cab at the moment, but eventually it'll be powering either a fFearful or one of those cool Big E cabs. I like playing with weird effects, but for amp tone I'm definitely more of an old school 60's-70's rock guy. Early Zepplin and Sabbath, Cream, Buffalo, as well as some more modern stuff that cops that feel like Devil Doll and Witchcraft. If it can also handle a hard overdrive sound ala Truckfighters and a thick dub reggae vibe then all the better.

Given those parameters, which amp makes the most sense for me? I love the sound I've heard from a Streamliner but that's not an option on this trade.