Hey poptart!
I've found the Portabass to be a springy, lightweight, little gem in the Ampeg family. The 250 has some seriously solid punch, and on one of the combo models I believe the head is removeable so that you can use it as a combo or to drive an 8 ohm cabinet. It's a pretty solid buy. If you're looking for something more like what you're probably running right now, the SVT Classic remake is absolutely stellar in my opinion for crisp clear tube tone through and through. I'm just not sure if you need to be lugging around an 80lb head and cabinet or if a combo will do. Do you really need the tube tone?
That's your call. Let me know more if I can help!
Peace,
ShackMan
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I love science, and it pains me to think that so many are terrified of the subject or feel that choosing it means you cannot also choose compassion, or the arts, or be awed by nature. Science is not meant to cure us of mystery, but to reinvent and reinvigorate it. -R. Sapolsky
Upton Bass Custom 3/4 Upright, BSX Custom Allegro EUB, '80s Peavey T-40, MIM Active Jazz Bass, Godin BG-5 (for sale!), Fender Bassman 100 , `68 Fender Bassman 50 head, SWR Goliath 4x10, Markbass 2x10 cab