Anyone know of a good alternative to the factory radio? I want to upgrade my 98 740IL to a good Nav-radio system.

Kenwood make a couple of good double din modules with 7" screens that should fit in perfectly. I was thinking about it but I'm too worried about loosing full trip computer functionality.

I can't think of the model off the top of my head, but I think it was a 7000 series. You're looking at about US$1000 for a complete set on eBay with Nav, TV, Bluetooth and the actual unit itself.