If you're thinking about spending $700 to upgrade your radio, you might think about just going for a 8.4 swap.
If you buy salvaged parts from car-part.com, you could probably get it all taken care of for a comparable amount of money, especially if you don't care about Nav.
You would need either an RB5 (Nav) or RE2 (non-Nav) radio, the 8.4 screen, the 8.4 bezel, and a new climate control panel with the SD card slot.