I've got a high end alpine and its great. Its one of the few head units that has 60w x 4 peak which means you only need one amp to drive the sub. I've got 6 1/2" polks up front with seperate tweeters mounted in the stock location and polk 6x9 3-ways in the rear - crossovers all around. That plus a 300w pioneer amp driving a 10" MTX Thunder 8000 sub makes for a stereo that will rattle the teeth out of your head. I put about $1200 into it but you could save quite a bit if you went through ebay instead of Circuit City like I did. It's not a competition stereo system but it sounds about 5000 times better than the stock.