I say get the Pioneer AVIC-F90BT. I think they're like $650? Tons of features... (such as: built in BT, build in Nav, Voice search for calling, nav, & iPod)
Friend has the AVIC-F700 and I loved it. The F90BT is only better.
W/ all these questions on which to buy, are you sure you're ready to run all of this? Especially when you don't even have the car yet?