It depends on if you want Bluetooth or USB Wireless. Typically I went with a Bluetooth mouse because I don't want to use up my only usb port. I tested 3 Bluetooth mice:
Microsoft Sculpt Touch Mouse - Superb/smooth tracking on par with USB wireless mouse. I just could not get used to the touch scrolling. In theory it should work great, but it just didn't scroll with the same amount of confidence/control as a normal scroll wheel mouse could.
Microsoft Bluetooth Notebook Wireless Mouse 5000 - Great tracking but lacks in comfort for me. It just didn't feel right in the hand.
Logitech V470 - I ended up sticking with this one. Tracking is not as great as the Microsoft mice, but it was the comfort/good fit in the hand that sold me. I also love how the tilting scroll wheel can be used to go back/forward on web pages, file exploring, etc. What I don't like with this mouse is it takes 2 seconds to turn on/wake up, while the other 2 are almost instant.
I never bothered with the wedge mouse since there is almost no consideration at all for ergonomics/comfort which is important for me.
If you're going to go USB Wireless then there are tonnes and tonnes of options. I love the Logitech M305 which is really cheap, almost indestructible, comfortable, has smooth tracking, and has the same tilt scroll wheel.