Have a pioneer avic z3 unit in the xb. The unit is about 3 years old now. Still an amazing unit. Recently added the back up camera. It's a double din size and will fit jeep well
You will not go wrong with pioneer, alpine, clarion, or eclipse. I think pioneer was one of the first to start doing after market applications for GPS/DVD.
Like someone just mentioned, it can be pricey. I think that 1200 is a conservative estimate. Not sure on what the units cost now. I'm thinking a reasonable estimate on all work done could run you 300-500 for parts and labor plus unit cost extra.