Okay so my jk came with the single disc player and I'm looking to upgrade, don't know a whole lot about the mygig receivers. I know I need to get one with a high speed bus, and have found a 30gig one for 350 bucks, is that a good price and is it just a plug and play switch over?

 

What year is your jeep? What radio is in it now?
What year and model is the one you're looking at?
What did it come out of?

$350 is a bit low. $600+ is usually around the grab price for a used (excellent condition) 2011 RHB or similar. Those are plug and play with a '12 JK.

 

My jeep is an 07 and has the single disc mp3 unit, the mygig that I am looking at buying is a RBZ model? Out of a 10' journey

 

Look here:
Jeep Grand Cherokee WK - MyGIG Multimedia Infotainment System radios

The '10 "should" work in an '07 since they're both a high speed bus. Uconnect would have to be installed if you want that. The price still seems very low. Is it off eBay?

 

Craigslist, seen a few on eBay for around 400 though

 

That RBZ is not the navigation model so I was wrong. $300+ would be about right for a clean unit.
I dropped a '11 RBH (nav) into my '12 JK and it's a great radio.

I have to admit I'm not that familair with the '07. If it has steering wheel controls they should work. uConnect (handsfree phone, etc) is an external unit which you'll need to buy if you want that stuff. Search "mygig" on eBay and you can find that stuff if it's something you'd want.
The radio uses one antenna for Sirius/AM/FM so you may need to get an adapter for your antenna. Still a decent price.

I'd gamble on it, especially if the owner is somewhere fairly near.

 

Pulled the trigger and bought the RBZ unit for 275, it's like brand new, don't need the navi since never even use the Garmin I have, hopefully get it hooked up this weekend, thanks for your help

 

Got the RBZ hooked up tonight, it's a good radio, having the HDD will be nice, no more having CDs, works perfect

 

Good for you!
Enjoy your tunes.