Matthew said:never heard of arc...i was also considering infinity speakers as well.
parks853 said:if you are going to have amps and dont need to power the speakers off the deck, then you can get the alpine 7995. Crutchfield has it for 299 shipped. awesome HU and for the price you can not beat it. http://www.crutchfield.com/S-yZL5dKmAwAX/cgi-bin/ProdView.asp?i=500CDA7995 Alpine is getting rid of that model so it is on clearance. My buddy has one itis nice. And you can not go wrong with alpine they are the best.
If you want to power some speakers off the deck then I would reccommend the JVC stuff. I have had mine for a long time. I have had it in 4 different cars and let my friend borrow it (it has been around like a record if you konw what i mean). I have not had any problems with it and it looks great with the silver plate that surronds the stereo and controls.
I have the kd-sh99 but the new models are better they have more options. If you get the top model it will have mp3 playback, 4V preouts, prob a 7band eq. nice stuff.
Here is the link to JVC you can check out the different ones and they list retail price which you can prob do better than that. http://www.jvc.com/product.jsp?productId=PRD3201100
Good luck