I had a Logitech G5 which has the classic design used by the similar G400/G500 and is such a comfy design.
I now have a Corsair M60 which at first glance looks like it wont be as comfortable, but it is.
I have a claw grip i think, would the m60 suit me?
I can reccomend the Saitek Rat 9, I'm using the latest drivers and any tracking problems it had are now gone. Still has the lift off issue but this I think has been lessened quite a bit.
It used to track oddly on some surfaces, but it seems to be all good now.
If you don't want wireless could get the Rat 7, its identical except its wired afaik.