The TSX navigation system will give you voice control over the climate control and stereo, in addition to the regular functions. It is very trick and I've never discovered any bugs. If you can afford 2k more get it. When you go to sell the car the navigation won't add much value, however.

I think the Acura navigation systems are the best on the market and, because it's OEM, you don't have something sitting on your dash or whatever.