Right now i have the boston acoustics prem sound system that came with my commander. I am looking at buying the stock 6disk cd player with sirius. Im not really an audiophile, but what would my other options be? i listen to my sirius more than anything. I guess i just want to know if it would be worth it to get the stock 6 disk or go for something aftermarket? I have also looked for the nav unit, but had no luck. Can someone give me the model # or brand that it is? Thanks a ton!