Touchscreen Headunit - 08 Double Cab - Help

I am looking at upgrading the stereo head unit in my 08 Double Cab (lacks Bluetooth, USB and AUX.)

I have the JBL System in the truck, is this an issue when upgrading?

This one is a descent price and has what I want.. Will it work.. I don't want to have to spend extra money or change anything other than the radio.

http://www.bestbuy.com/site/kenwood...rd223600050000&skuId=9999224900050000&count=0

 

If you want to keep the JBL speakers/amp/sub you'll need a harness like this.

http://www.crutchfield.com/p_127TATO/PAC-TATO-Wiring-Interface.html

As for the Kenwood, its a good HU. You might be able to find it a bit cheaper than bestbuy if you search around.