I've heard good things about Logitech, not sure which one is best for you though.
I would certainly advise anyone thinking of getting any M$ related hardware to think twice. I have bought 4 keyboards and mouse sets from them over the years and they have all left something to be desired. Their build quality has severely deteriorated over the recent years, although it was never great to begin with.
I currently have yet another wireless desktop - Wireless Optical Desktop Elite. The best thing about it is probably the name lol.
http://www.microsoft.com/hardware/mouseandkeyboard/productdetails.aspx?pid=016
Despite having the receiver right next to the keyboard the signal doesn't always get though when typing or playing. There's no other device interfering. Some of the larger keys (SHIFT) are far too stiff and require pressing directly in the middle to even work. All the keys are extremely hard compared to other keyboards I've used, both M$ and non-M$. The keys are semi-transparent (frosty in appearance) however all you see is the bloody dust clogged inside the keyboard which means I probably need to clean it again.

It also has the stupid F-Lock key which isn't remembered each time I boot Windows or Linux and doesn't use the standard F-keys by default, irritating as hell.

The fancy silver media keys wear away in no time - the symbols and colour dissolves easily.
The mouse is erratic at times with sudden anomalous movement and doesn't always fire when I tell it to (that's my excuse for not playing Nexuiz well at least

). The mouse wheel is extremely sensitive and feels like jelly, it doesn't have any tactile or auditory feedback such as clicking on the wheel notches - it's entirely smooth action. It's a nightmare in games whereby I simply can't use it anymore. The middle mouse button is incredibly rigid where you must apply a dangerous amount of force to even use it. There's also a useless mouse wheel on the keyboard as well.
Both mouse and keyboard are creaky and squeaky, especially the keyboard. The keyboard requires 3 batteries now instead of only 2 and only lasts 2/5 as long as the last M$ wireless keyboard battery lifetime. The mouse is very light without batteries but is much heavier with two alkaline batteries that M$ recommends. Rechargeable don’t last any where near as long and are annoying when they fail in the middle of a match – I then quickly take the dead keyboard batteries out and exchange them with the mouse batteries just so I can type “arrrrrrrh no bleeding batteries” and then charge them for the next hour or two.
All-in-all, I don't think I’ll be recommending M$ mouse and keyboard duos even to my worst enemies (I first have to find some enemies

).
I hope I wasn’t too unhelpful un-venting my frustration, lol. Now I think I’ll go look for another M$ set so I can have many more countless hours of fun again.

Someone please shoot me.