Ok! I'm into rock, classic rock and hard rock basically. I have a budget of about 500 EUROS to spend on a guitar amplifier. The thing is, good Marshall's seem to be too expensive?

What other amps for rock do you strongly recommend?

Btw, at the moment I have a strat, but I'm going to change it for a Gibson SG Special Faded.

Have a look at the Laney VC series, great for rock sounds you could have a look at the Crate Palomino series aswell
MIA Fender Strat
Yamaha FG-450S
Crafter 12 string
Orange Rocker 30 combo
Vox AC30CC2
Epi Valve Junior
Fulltone Clyde
Danelectro Free Speech
T.C. Electronic Vintage Dual Distortion
Boss MIJ GE-7 (c1987)
Boss TU2
MXR Phase 90
Artec delay
VC15. 30 if you're gigging.

^ The Palominos aren't available in Europe as far as I am aware. They're certainly not available in the UK