I'd like to get some recommandations on replacing or adding to my '05 stock radio/single CD player. What I want to get out is more music without changing CDs often, without spending too much. If it fits my budget, I'd like to add in dash DVD/Nav sytem, too. By reading through some posts, a couple of ways I could go. 1. replacing HU with after market unit. 2. adding a unit. ( other than iPod, is it possible to add after market CD changer and/or mp3 Player?) Without losing any functionality (i.e., stirring wheel control), what would you recommand? Thanks in advance~