I've upgraded Integra w/ CD-mp3-WMA player(DEH-P4700MP), and now run 2 Pioneer 3-ways thru individual boxes. Am going to buy the Infinity Reference 6903i's, and build box for them, possible allowing for/including a single sub. Regarding amp choice, I've narrowed it down to the Sony XM-4060GTX(60wx4@4ohms, @ $118-199), and the Kenwood KAC-8402(60wx4@4ohms, @ $149-249.) I'm really only planning on running the Infinitys and Pioneers, or Infinitys and better 5 1/2's up front. By the specs, both are MOSFET, both 60x4 RMS, but the Sony is showing a 600w Peak, to the Kenwood's 240w, and the Frequency Response is 50kHz-5Hz for the cheaper Sony, but only 30-10 for the more expensive Kenwood. Any ideas or experience w/either of these at all for anyone? I would think that the equality of RMS power, the better Freq Resp, and the lower price would make the Sony the better deal, unless it just sucks as a product. Would anyone argue with me?