Thanks for the responses... all except for one.
Maybe I suck at searching... ever think of that?
Anyway, I decided the IS rocks, but it's just a little too small. I'm now considering either an ES with all the goodies including ML, or looking at a TL or RL.
My wife has an M35 and the hack for Infiniti is about exactly the same process. I did it in her car, and it's very worth it. It appears you can do this hack on the IS or any Gen V unit of Lexus'.
I just wish the ES drove a little more sporty than it does. It would be a slam dunk otherwise. It's just so cloud-like, and I prefer a little more connected feel. The looks of the ES are ok, but no where near as nice as the IS.
The GS has the Gen IV system in it now which doesn't even play MP3's, and I can't wait for the '07's... and they're above where I want to be price-wise.
The TL doesn't have all the goodies, but it serves my purpose, has a pretty nice audio system (just no DVD video) and is about 10K less than the ES I'm pricing. This makes it a tough call b/c I'm not sure if the extra space, extra technology, and cushy ride are worth 10k more.
Anyway, thanks again for the help! It's much appreciated.