First i bought this JVC KDR530 http://www.bestbuy.com/site/JVC+-+50...&skuId=4005163
and loved it,it was $89 at best buy.I ended up returning it because it would not work with Epic over usb and required separate bluetooth adapter.
I returned it and decided to try Pioneer DEH-6300UB http://www.bestbuy.com/site/Pioneer+...&skuId=1752039
,it was POS,buttons looked like they was gonna fall off any minute now and menus and sound was nowhere near JVC,plus it would not connect to my Epic over usb.
Then i wanted this JVC KDHDR71BT(same as KDX80BT but with cd) http://www.bestbuy.com/site/JVC+-+50...&skuId=4888181
because it said on the box that its compatible with not only iphone but blackberry and android but it was sold out at best buy.
So after days of research i finally ended up getting this Kenwood http://www.crutchfield.com/p_113BT85...er-reviews-tab
for $239(yeah i know more then double as JVC,lol) but man it was worth it.
The reason i went with Kenwood because i read that JVC and Kenwood merged together, sense i loved first JVC i thought that i would get same quality from Kenwood and i did.
To make it short,it still doesn't play music from my Epic over usb but only charges the phone.But thats ok because it plays it over bluetooth and i can control my Epic from Kenwood(switch tracks,answer phone,display album info and more).Its real pretty to look at, a lot of options,same great quality as JVC(and not a pos like Pioneer),and sound is definitely superb(better than JVC but its in another price range,im sure that JVC in this price range be just as good).
If you want good solid built quality and great sound go with JVC or Kenwood because they are same company.If you want higher end models go with JVC Arsenal or Kenwood Excelon series.Their cheaper models are solid but don't pack as many features and sound is warmer on higher end models.
From my experience Pioneer's quality is not what it used to be(they still heve solid speakers) and i heard the same about Alpines.I cant comment on Sony,they used to be pos but i think they improved lately.
I say that JVC and Kenwood get you best value for you money from my experience.
Oh and i recommend Buying from Crutchfiled because you get free wiring and dash kit and end up saving $40,i wish i knew that before i bought them from best buy.And their tech support actually know what they talking about-which is rare these days,and it only took 3 days for my shipment to arrive.