I'll pitch into the SBIG chime. They know their stuff, in particular the read-out electronics.
As for wheel, well, I have the 2" SX on mine and have no problems as there is an ASCOM driver, even for 64-bit systems.
Nebulosity is far superior to ccdops and is dirt cheap. It handles any ASCOM wheel you throw at it and is fully scriptable.
Tak FSQ106EDX III, EdgeHD 9.25/Lepus/HyperStar3
NEQ6 Pro, 10micron GM2000HPS, GM1000HPS
SBIG ST8300M, SX M26C, QCI 683wsg8, SBIG ST-i guider
SX Wheel, filters to fitAstro software and opinions on http://astro.frejvall.se