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Hey, I have like $600 AUD to spend on an amp (not much, lol)
I don't know anything at all about amps, nothing, so could you tell me basics like differance between tube and wateva. Good brands etc. I'm gonna be playing a Godin signature lg and a Ibanez Talman TCM50 (yes an acoustic) through it. Something that can sound good with shredding going on and a little jazz here and there. Folk rock as well. Could you help me out, thanks.

Oh and i forgot to say, I need this to practise in a garage with a band and play for small gigs (under 150 people) with a band, PA system not always available, so a big punch would be nice, and the smaller the better. I know im asking a lot, i was thinkin the roland cube 30, they sound nice.

try out the Fender Blues Junior (15W), or the
Hughes amp; Kettner Special Edition Tube 20th Anniversary (20W)

my opinion

hehe, now i see you have updated the post...
if loudness is needed, you may also test the peavey DB210

peavey classic series are hard to beat...30 or 50 would probably work out fine

traynor YCV series 40 or 50

and try to find them used for a better price!