The red one, 1990 RG550CM was bought after taking routers to three Stratocasters trying to make them into the guitars I really wanted, then finding the 550 and all that I'd done to the Strats was already there...
The silver one, 2004 RG2750EXVSL was an impulse buy. Saw it hanging in GC used last year, frets almost no wear and the body nearly perfect, walked out with it...
The blue one, 2010 RG1550MPBL, was bought after I sold a 1999 RG520QSB... I played it in a local music store and just had to have it.
All standard tuning... different p/ups in each.
Silver: Stock IBZ/DIMARZIO
Red: Evo Bridge and Neck, HS-2 in single mode
Blue: Evo2 Bridge, P.A.F. Pro neck and HS-3 in single mode... a little hotter and warmer than the HS-2.
Guitars are same woods, but all sound very different with the p/ups and just, well, wood is always different, even when it's the 'same'.