Scott
I just replaced the stock speakers with some inexpensive infinities, they were $99 a pair at Circuit City. I was a little worried because I bought the speakers first and wasn't at all impressed with them but as soon as I hooked up the new unit they came to life.
Raymond
I just put in the Panasonic 909u, it is DVD-Audio and DTS capable as well as full 5.1 and all the rest. It is a single din size with a very small outboard amp. The sound is amazing. This unit had an MSRP of 1999 but they are going new on ebay for under 500. I highly recommend this...