I would suggest the Logitech Performance MX. I have two of them and love it.
I love the trackpad on my MBPs and MBA. So I bought the Magic Trackpad for my Mini. Unfortunately it's not as great as the trackpad on the portables. It's just not comfortable to use (for me) so check before splashing the cash whether it will work for you. It's ok for browsing the web, but if you need to be able to click precisely on stuff, a mouse is the much better solution. The ergonomic of the Magic Trackpad don't work for, as I said already, but you may find that you like it.
I love the trackpad on my MBPs and MBA. So I bought the Magic Trackpad for my Mini. Unfortunately it's not as great as the trackpad on the portables. It's just not comfortable to use (for me) so check before splashing the cash whether it will work for you. It's ok for browsing the web, but if you need to be able to click precisely on stuff, a mouse is the much better solution. The ergonomic of the Magic Trackpad don't work for, as I said already, but you may find that you like it.