I have a lot of preconceptions about the different brands of amps, but I live in South Africa where guitar equipment is non-existent. So help me out! I'd like it if the guys who've been around for a while can help me out and tell me what I have wrong. This is what I believe of the amps and their built-in overdrives:

Marshall:
Good match: Gibson LP.
Cleans: Very tubey and bluesy. Warm midrange. Smooth highs. Somewhat lacking in string definition.
Overdrive: Low- to mid-gain. With midrange high, very AC/DC-like (especially with all-mahogany humbucker guitars like LPs); with midrange cut and bass boosted, solid sound for some hard rock (but still not high-gain). On low gain levels, extremely good articulation.

Mesa Boogie:
Good match: PRS Custom 22.
Cleans: Very solid state-like. When compressed, very good for Strat-like funky rhythms. Virtually attack-less but individual strings can still be heard separately.
Distortion: High-gain. With mids about level, very Linkin Park electro metal-like. Cutting mids gives extreme nu-metal tone.

VOX:
Good match: Fender Jazzmaster.
Cleans: Very metallic and almost (but not quite) a little twangy on lower strings. Acoustic-like sound; individual strings can be heard clearly when strumming chords.
Overdrive: Those VOXes that actually have a gain channel (pffft) lean strongly towards heavy breakup distortion tones rather than smooth drive, but at very low gain levels.

I don't know jack about Fender (gasp!), Orange, Diezel, VHT, Mojave or anything else. Help me! I'm still finding my sound so any advice here is greatly appreciated.

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It's funny how you should say that...

Fender 2005 Mexi Strat > Sovtek Big Muff Pi reissue > Roland JC-80

Soon to come: Wilk, Schaller locking tuners, String Savers, Trem-nut, Boss CS-3