If I could just throw one piece of advice to the original poster, try and wait a couple of months from initial delivery if you go new. The main problems I've ever heard from most new LRs seemed to always be from the first batch to come out of a "new" year. Hopefully '11 will be the fix year, and w/o any significant upgrades, but....
Re: stereo. Get the upgraded sound system and have someone familiar w/ sound engineering "tune" your system. You don't need another system. Trust me. I used to be a musician/producer, and am very picky w/ sound. The only mods I believe in involve sound, and if this vehicle wasn't capable of playing my music to my specs, I'd rip it out and sacrifice the Nav and info. But it can, and it plays it well, and I have an '06, and I believe the '10s & on have even better systems. It's all in the tuning. Don't expect to just put in your music and it'll sound good.
Search here, I believe someone did a nice write up on getting the most of your sound, and if you are so inclined to blast music and scare your neighbors into thinking some gangster has moved in. :dance: It can handle it. Within reason of course, but it can def wake people up, with very clear (non-distorted) sound.