I could write a whole book on this subject right now...
I'm actually selling my V-4 all-tube '72, despite many outcries from the local music community. I actually had 2 people stop me at a store where they were pricing my equipment and go "what ARE you doing selling that thing?" (I have an Orange twin that I am now using, that's why) V-4's are pretty sought-after amps in the Boston and NY scenes right now, so I can fetch $500 for the head, even though I bought it cheaper 3 years ago.
Anyhow, keeping in mind that I wouldn't dream of trying to sell you on something that I am actually selling (because who's gonna pay to ship this?), I really think you might want to give a V-4 a spin (or the V-4B, of course). It is the most versatile head I have ever played and my bass friends around Boston are all defaulting to these things (as are many guitarists). I have it going through an Ampeg 410 cab (tweeter disconnected), which gives it a lot of kick - not the same as the low-end punch of an SVT, but not too far off. If anything, that's the drawback - it's a jack of all trades, but a master of none.
Keep in mind, versatility comes with a price - patience. You have to put some work into getting the sound you're going after...
My bass player is using a Fender combo studio bass amp, which he loves...I rarely see them around, but for a combo unit, it's plenty loud (easily competes with my V-4) and I think retails used around $500. He also plays a practice-space/small gig w/DI Ampeg Rocketbass, which is a solid-state. I think I recommended that as a good, very portable amp in another thread this week...Anyhow, he has never had repair issues with either, aside from the usual tube changes and various wear/tear issues.
But hey, if you're sick of carrying shit around, don't have much space at home/the space, and aren't playing out much, I'd strongly consider a combo for the convenience and practicality over a rig.
Good luck. My first amp was a Crate...
KPH