i own one. Basically the dash doesn't have the plushness you would find on a lexus/bms but it outperforms every suv out there and most sport cars. I sold my x5 for one and couldn't be happier. It has all the gadgets navigation, autoheadlight hi beams, and so on and an upgraded 6.1l hemi(versus the 5.7).
The range rover supercharged is the only prettier suv but is way sloww and if u really want an suv with a history of reliability issues that one is the one.
To find info on snow tires u can use either of the following 2 sites
http://www.cherokeesrt8.com/forums/index.php
http://www.srt8oc.com/forums/
Also wait for a good deal. i picked my 06 up last july during employee pricing for 40,000 fully loaded. However not all dealers were offering the employee pricing. It saved me 5k
And u get a free trip to
www.srttrackexperience.com