Head-wise, the Walter Woods Ultra is, of course, the shiznit, but to fit in your budget, let's say iAMP 800. Rack rigs allow you for a ton of options, and can ultimately get you the most flexibility and most power, but will be a bit more to lug around, of course.
For cabs, man, you have a lot of choices. But, for when I double, where are some configurations that I find work very, very well:
- The aforementinoed Bergie HT112/EX112 "Mini Stack." I just recently picked up this setup, so I don't have any real "miles" under this rig, but man, do I like what I hear so far!
- Two EA Wizzy's. These are 4 ohm each, so you've got 1,000 watts from the iAMP 800 powering both cabs (be careful with your gain!). The Wizzy is a both very full and slightly warm sounding, and very clear. I used to think that these goals were mutually exclusive, but somehow the Wizzy does both. No tweeter, but plenty of high end articulation. This rig sounds stellar on upright! And two Wizzy's are definitely more than 2x1 Wizzy.
- Hevos Midget. I only have one of these, but it's the loudest darn 1x10 I have ever heard! Clarity like you wouldn't believe, and very much a full range cab, though not quite as full sounding as, say the Wizzy or an ACME Low B-1.
- Two, or better yet three, EA VL-208's. IMHO, these cabs are about as good as it gets for full range, articulate, musical cabs at moderate volumes. Midrange is both detailed and smooth like buttah, and on URB, two VL-208's is magic. I do find, though, that you really need the third cab to bring out respectable low B performance for electric. But let me tell you, the difference between 3 and 2 of these little beauties is astounding!
- VL-110's are another great little cab. Not quite as excellent in the midrange as the VL-208's, but perhaps a tad more low end. Mix and match with VL-208's very well.
- VL-108's are also da bomb (I only have one, and haven't gigged with it yet). Super clarity and surprising volume out of a miniscule package. Of course, if any of these come up for sale, I'm hoping to jump on them myself!
- Accugroove makes a number of great options. For their smaller cabs, I have tried the Mini Whappo and the Tri 208, both of which I absolutely love, but both of which would probably have difficulty putting out enough volume for me in many doubling situations. The Tri 208 is really a studio monitor type of cab, but would excel in a small setting, particulaly on upright. The Mini Whappo was the cab that sold me on Accugroove, but it's not a monster on the low B, as many of Mark's other cabs are, and it is only rated for 250 watts. If the Tri 210L isn't too big for you (or the Whappo, Jr. for that matter), I have used these with double bass and electric, and on all accounts, they excel! While I haven't tried the Tri 110 or Tri 112, I would expect them to be excellent options.
- With regard to ACME, I only own one, a 4 ohm Low B-2, and I will say that it is an exceptional cab that can get a bit too thick in the low end, if you aren't careful. I found that I really preferred it with my iAMP 800 as opposed to my Walter Woods Ultra, as the iAMP 800 seemed to be able to coax tighter low end out of it. Mids and highs are a tad polite, but very musical and smooth. I would think that two Low B-1's would be somewhat more well suited to a doubling gig.
- One last suggestion would be an Epifani T-112 with a T-110UL. This is a great combo of Epi cabs, and pretty much my favorite "Epifani sound."
Any of the above suggestions would, IMHO, serve you quite well. As always, it comes down to personal preference - and what is available for the best deal, of course!
Good luck, Tom.