As far as getting in & out of the back seat. Tone sells some brackets that shift the front passenger seat forward a few inches. They work well. Unfortunately there isn't anything that can be done for the drivers seat to give you more room. I know that LittleBeast just reclines his seat to get the headroom he needs.

Other mods - just start reading. There's nothing that HAS to be upgraded. It's all a matter of taste. Usually one of the first things to upgrade tho are some fixes on the window regulators. There's some threads on that topic that were active earlier today so you won't have to search too far.

BTW - if you have the stock sound system, don't use the CD player. Chances are pretty high that you won't get your CDs back out.

Welcome to the addiction.