if you're going to sit in it a lot or for extended periods, I would suggest something mesh. I sit in my work chair 10 hrs a day 4 days a week. it being mesh helps stay cool.
seems to be a lot of good feedback about this mouse here. I've read other places that the drivers don't always work with win7. anyone experiencing that?
if you wait for something to come out, news of something newer/better will soon come along. if you don't bite the bullet and just buy something, you never will.
if you're waiting for something specific to release (ie: sata 6g/s), sure wait.