I use an older Dell branded "mini" bluetooth mouse. I get mine with an older laptop and loved the feel and function (rolling wheel and 2 left side programable buttons). Battery life is exceptional with almost 1 year since battery change and I use it daily.
You can find it on eBay and other "used" sites for about $15-25 in a couple of collors. I have one that is black for my laptop and one that is red for my SP. This keeps me from the confusion of which mouse is paired with which device.
I'm using a Microsoft Sculpt Mouse and it seems to work fairly well. However, it doesn't have a scroll wheel. Instead it uses a raised rectangular "swipe bar" or whatever they call it. It does allow scrolling to the left and right as well as up and down which is nice and you can tell they did that for Windows 8. It's about the size of a medium sized USB or corded mouse so it fits the hand well. If it had a scroll wheel, I'd be even happier with it but as is, it works fairly well for what I need and it does free up that USB port.
I got a Logitech T630 mouse last month.
I really like the touch ability and that it can directly control Win 8 like it does.
Dose it require SetPoint to function properly?
I had used it for about a week before I had time to even look into such things. I finally go around to installing Setpoint, and if I recall, it improved the way the scrolling feature worked. So it adds some features, but isn't required.