CHEVY TAHOE!!!!

I got a new Chevy Tahoe LS for Christmas and I'm really wondering what I should do first and what I'll be saving up for. I need suggestions and ideas from you guys out there who know about fixing up Tahoes.




I already got a billet grill from the Chevy dealer to sweeten the deal.

First, I don't want to go over the top with fixing it up... Neon lights, dropping it.. Not me. Only things that are useful, then after that I can mess around.
Right now I'm looking to add (in order):
Headunit (Pioneer AVIC-D1) *should I wait for the AVIC-D2 or AVIC-Z1?* which are coming out this year. I really want one that will allow me to use navigation, iPod and bluetooth technology.
Subs and speakers, I don't know which ones but I want the ones that can hide or not take space in the back since I need the space for 3rd row and luggage.
Lights, the front lights and rear lights should be changed and made different. I'm not sure if I should smoke em or get euro style lights.
These are on them right now.

Rims, below, I got the 20" chrome rims just for now. BUT I'm looking to get that upgraded to some 22" rims.
Muffler, at least to make it look different than the factory muffler. I don't want to make it loud and annoying since I live in a quiet neighborhood.
DVD/video game system in the back, for the passengers... :P