Well - one of the best things I ever found was an aussie amp called WASP.
Well, thats not strictly true, they were designed by a kiwi, called HOLDEN and started in Australia under the name WASP. But anyway.....
They work GREAT for bass. AND they made a 200w monster - and slave!
I play an all tube 200w (4x6550's) Holden WASP slave.
My preamp is a sansamp.
All up and bought; I had the WASP re-tubed plus sansamp for less than a gorilla. BEAT THAT I SAY!
They're never more than a grand on the'bay but expect a re-cap and new tubes are gonna be needed, as they are rather old.
Shloads of volume.
And being a vintage 70's amp, I get questions from people occasionally (what is
that!!?!) and occasionally the odd AC/DC diehard will go "that's an AC/DC amp!"
WASP's do turn up every now and then on Ebay - but you may be lucky and see one online at "Tym's Guitars" in brisbane.
He's a big fan of wasp's, and usually has a few.
As far as cab's go - contact a local aussie cab builder and tell them what you want, and I'm sure they can build you a killer 2x15 or ***x10 or something you like for less than an ampeg fridge new.
Here's a few contacts for a start;
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MC cab's in perth are freeeeaaaakin beautiful....check 'em out. It's surprising just how cheap work like that actually is!
Have fun,
smo