Just to throw my 2 cents in, Peavey has a history of being very durable. Amps from their 70's lines are still in service. I've had a couple of SWR amps, and I can't say they were bad, but I can't say they sounded so much better than the Peavey amps I've used that I could live on the difference.
If it was me, I'd probably go with the Peavey. But I agree with the advice about combo vs head. You can be a lot more versatile with a head and a combination of cabs. Get a 2x10 with a horn and a 1x15 or 1x18, and you can cover anything from small clubs to some outdoor venues. Just take the 2x10 to small places and both to larger.
I have a Peavey T-Max 300 head that works quite well and sounds pretty good too. If I wanted to, I could hook up a second power amp and use the inboard crossover to biamp. But it weighs enough to anchor a battleship already, another amp would necessitate hiring an elephant to haul my rack.
But the amp I'm mostly using these days is either of two absolutely ancient heads, a Sunn Concert Bass from the 70's and a Seymour Duncan Bass 400, from the 80's I think. I've has the Sunn a couple of months, and it has needed a some service, replacing dried out capacitors and whatnot. But when it works, it's the best sounding head I have.