Hi guys, new to the forum and audio upgrades in general. The factory stereo in my nox works fine except for the aux port, which goes through bouts of perfect operation and then will randomly stop working at all. I'm looking at upgrading it, but that's a bit daunting for a newbie without a whole ton of budget to work with. Any suggestions for upgrade or repair? I don't have onstar or the bose system, it's the pioneer one(on that note, can anyone tell me anything about the pioneer system?) Thanks guys!