I've had a good few pairs down the years but all I have spare at the moment is one pair of grey SD7's with one caliper missing the locating pin for the spring (that fits in to the little hole on the frame/fork). Let me know if it's any use though.
The models you listed all have a fairly similar grey finish (not sure I'd call in a 'Ti finish' as such). In case it's any use, my memory of the different models is:
That they all work much the same (i.e. very well)
The 20 is a more basic model and you see quite a lot of them, the 25 is much lighter and don't crop up often
The lightest ones are the Mags (the Ti arms are heavier), but they didn't come with Ti hardware as standard
The finish on the Mags often suffer from deterioration so most of them look a bit ropey nowadays