The VT Bass would probably be great to go along with your amp, or a pedal with a blend like the Sparkle Drive.
[shameless plug

]There's also the Jekyll and Hyde which is another TS808 with a bass boost and has a distortion as well, the Boss BD-2 Blues driver which is a light overdrive, and the Bass Blowtorch which is a fuzz/overdrive with a clean blend.[/shameless plug

]
edit: Oh yeah, There's also the Polish Love/Bogdan Helter Skelter/'Lil Jovi which is a Way Huge Red Llama clone. Gets a lot of love/hate on here.