Oh this has my name all over it - doesn't it???
Here's the simple break down...
Accelerator X - $399 - ready to go... Does frames up to 23x31 - M3/MZX/DC or other rollers. Best value if you keep your frames smaller... (We have had a few 23x33 users take this kit also and it works fine - unofficially)
Accelerator 2 - $1275 - ready to go... Does frames up to 40x40 M3 - M3/MZX/DC or other rollers. More durable hardware - and a pretty yellow color!
Accelerator SA - $$$$$ - If you have M6's or Box Beams, this is the kit for you... Call us for availability though, we may or may not have one laying around for you.
Overall, if you can get by with the X, it does everything the other two do, but much cheaper and much lighter. Remember, you can use standard adjustable wrenches with it, they stretch any style frame and you can use standard 3/8" T-Nuts to add additional sizes to your tables. If you would rather have a turntable for it, for $400 you can get one of our predrilled turntables for quick size changing.