Starcraft II, Warcraft III and on 'rare' occasions FPS's and a lot of times some RPGs.
On a side note: I still prefer WCIII over SCII, sadly all of my friends are obsessed with SC more and I still dislike what Blizzard did with their Battle.net acting as the DRM implementation for their system. :/
Anyways, in SCII, I'm still experimenting with DPI settings, on occasions I'll play at max DPI at other times half of that (the max DPI for this mouse is 2000). Though, the mouse feels really 'jittery' in a way as well at times. Though, I'm not really using a decent mousepad and for some reason I hate the feel of this mouse. I don't know about the weight of the mouse, I did at some point take off the weights since I no longer really cared too much. To be honest, I got this mouse since it was recommended to me and I wanted a 'laser mice' that I heard was really good, never really felt too happy with it.
Thing is, I always found DPI a little confusing, since I noticed higher DPI settings make mice move 'too fast' on occasions unless you lower the accelerations but I heard arguments against that on some places on the web. How much does DPI matter and how does accerleration effect the 'DPI'? Why did you say laser mice 'are ****,' also I've noticed a few reviews mention the sensor on the mouse suck if so, how important is the sensor? Though it is just personal preference, as you said. :/ I'm just being really indecisive, I asked my friends and they said while the stores they've gone too have laser mice, they don't really have 'razer' ones.
I do know I will want a decent mousepad, since from what I've read depending on the material those are made it can really effect mouse accuracy in a really positive degree. Also, in FPSs I have used the increased speed in DPI before but only because I was stuck in a level on crysis where I needed the extra speed.
I don't know what grip I use either. Never paid enough attention to know for sure. :/