I would recommend Gyration remote for sure. It's RF based, and therefor have good range and no path of vision problems. The mouse gyro works really well, and there are shortcut buttons on the remote that work vell. As an example the back button, and the switch view button (TV, Std View, Display View). A few of the media buttons don't work though. And as it's RF it might be hard to reprogram the remote. On the possitive side it's programmable to learn a couple of other devices, and then uses IR offcourse...
Logitec Mini is a good device, but it's a bit expensive. It uses Bluetooth, wich has it's advantages. But is not programmable. The mouse pad is rather effectiv, though not at good as the gryration. A major plus that the Mini is actually a keyboard, so you can write stuff.
Most often I use my Gyration, but grabs the Mini every time I'll write something. So it all depends on how much you really need that keyboard.
Harmony One. If you have a lot of equipment, this baby will do the work. You'll have to use the remote with the keys only, as it has no mouse functions. If theater view is you're thing and you don't need a keyboard, and have a lot of equipment; this is a good choise for a IR remote.
I do NOT recommend iMon Pads. They feel cheep, and they are cheap. It's a reason they don't work that well. And mouse control? No good.