Re: new head unit and speakers
Going with OEM Nav, you may as well upgrade to a MyGig system for the amount of cash that you'll have to drop on it. If you're looking on the cheap, I remember seeing that some Chinese knock-off company was making a wannabe MyGig system that plugged right into our old systems and it was like $400.
As for speakers, I replaced my factory Boston system with the Boston SE series, and it's like a night and day difference, even from the "premium" OEM audio system. I couldn't be happier with them. Those I got on the cheap through sonicelectronix and had them beat the prices for several shady websites that I found.
The speakers cost me right around $200 if I remember correctly, and I did the full upgrade with 2 - 6x9's (3-way), 2 - 3.5" (2-way), and 2-6.5" (2-way). Remember that the factory system with the crossover makes having anything but a woofer in the doors useless, unless you want to put in a component system or rewire the crossovers...
'05 WK GC 5.7L HEMI, Goodyear Wrangler SilentArmors, Monroe Reflex Front Struts/Monroe Load Adjusting Rear Shocks, EBC Drilled/Slotted Sport Rotors, Wagner Ceramic Brake Pads, Taylor Shorties, SRT8 Stock CAI Conversion, K&N Drop-in, Block Heater, 18.5% Tint All Around, Boston SE Speakers, 12" Alpine Type-R Sub w/ sealed box w/ RF PRIME R1000-1D, ScanGauge II w/ windshield mount, BT Catch Can w/custom bracket, Swagman Fork Mount Bicycle Rack, WeatherTech front floor liners, SRT8 Pedal Covers, eBay full LED lighting kit, Custom MDS Indicator LED Light, Mega Raizin Voltage Stabilizer & Grounding Kit, Challenger IAT Sensor.