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As the other posters have already noted, you can pretty much mix and 3750 units within the same stack. As they also noted, there are some "gotchas".
StackWisePlus units, the E and X series, lose many of their "Plus" stack features if you stack with original StackWise units. (If possible, I recommend avoid mixing the two generations of StackWise.)
The 3750G-12S offers SDM templates unique to it. If you stack with other units, you have to use "standard" SDM templates. (If possible, I recommend to avoid stacking this unit with any other models.)
As also noted, the X series with LANBase can only stack with themselves.
Only the X series support StackPower.
IOS versions and/or feature set don't always need to match. However, its good practice to have all stack units on the same IOS version. If you mix IPBase and IPServices in same stack, to avoid a single point of failure, two stacked units should have IPServices. (For a while, Cisco also had an Advanced IPServices feature set, but they, in later IOS versions, combined it with IPServices feature set.)
The -suffix power options and -suffix IOS feature sets apply to "as ordered from the factory". Often IOS feature set and/or power can be field upgraded. I.e. a unit's -suffix might not accurately represent what the unit supports, in the field.
