Well... I've almost completed all of my modifications to my "03" MIM Strat. I still haven't made up my mind if I want to change the nut to an LSR roller nut (I would have a professional install it) or a Graphtech nut like I have on my G & L Commanche.
In the meantime, I'm trying out different tremolo arms. I have the Callaham tremolo block with the press in arm hole. I've found that I actually like the standard FENDER MIM Strat handle better than the Callaham handle. The FENDER handle is much longer and I seem to get better leverage and control with the FENDER handle (it also seems more stable when threaded in).
Just for curiosity sake, what is your handle preference... ultra short (Gilmour), medium, or MIM Standard length?