So I've been looking at fender amps, I love the cleans, and the distortion channels are quite nice on those which have them.

At my local shop - Fender Twin Reverb - £989
Then there's a fender twin for 1189

I know the difference between those two, but I don't quite get what the difference between the different types of 'twin's are.

So far, I've found the 1965 Twin Reissue, and the Fender 'Twin-Amp'....so tell me...what's going on?
Epiphone Dot-335
Fender USA Tele
'82 30th anniversary Les Paul goldtop
1965 pre-CBS Fender Jaguar

turbo rat
+many more

Fender Twin Reverb
King's Full-tube 100 watt half stack. - £300