Hey everyone.. I have this 2003 Acura TL-s/navi but will be replacing this on Friday with an 05/ X5 4.4i. I can't wait!

The 4.4i, doesn't come with Navi.

Am I better off purchasing a Garmin or searching for an OEM navi. What do these typically go for. I'm not going to be dumping thousands into this thing just yet. I know for around $500.00 I can get the top of the line Mac Daddy Garmin.

Thanks