Which Amp to Get

I am planning on buying two amplifiers, one Rockford Fosgate 851X to send 100w RMS to the four speakers in my car, or maybe its 110 WATTS i forget, and another rockford fosgate amp to send 500 Watts RMS to two Eclipse 12 inch aluminum subs.  I wanted to get some amp suggestions, because I'm not completely set on the fosgate amps but they seem to have a good power to price ratio.  I want both amps to be the same brand, and my four speakers are fosgates, which can handle 100Watts rms each. fosgate components up front and 6x9's in the back.  Performance is my main concern, I don't care about looks much.  Also, does anyone have any comments about the fosgate amps.  Some guy said he heard they shut off due to overheating a lot.  Is this true?  Also with suggestions please be as detailed as possible as to why you are suggesting the amp that you are.

thanks

SQ is my main concern, how can you tell if an amp has good SQ or not without hearing it in person?  And are there any good online places to go read comparisons and/or specs on a wide range of amps? 

I do want a lot of power going to the four speakers, basically cause the more power you have going to the speakers the harder the bass will hit from them, and that's one thing my speakers lack right now.  I know I'll get all the bass I need from the 12's, but I would like to have bass coming from all parts of my sound stage.  I'm amazed at how much more bass my friend gets from his speakers that me, and he only has 50 watts rms going to each, where I have about 27 with my alpine deck. 

Glad to hear that you want to power things properly. Amplifiers make amps, a high current amplifier is your best choice to play something loud. Specs if you put the sheet to your ear, will never tell you how loud or how good a stereo will sound. Your friends 50w rms amp may have a whole pile more current to back it up as compared to the power from your alpine cd player. What you can ask for is opinions os a site like this and you'll get a pile of them (and some pissing contests as well lol, even they can be a learning experience though). Personally I would choose an amp built in the USA instead of a made in singakoreatiawanapore brand, my experience here is sound quality and overall power capabilities. Just because brand a and brand b have the same specs and are made in different places does not mean that they will sound or perform the same. I myself run Xtant amplifiers, another choice if they would have fit would be Diamond, then Eclipse. I am also a dealer for many other manufacturers, their product is great but the capabilities and performance that I wanted for my own system could not be offered.

A good bet is to pop into the local specialty car audio store and not the big box store. The big box guys have good product, some good knowledge and installers, but they are usually limited to this or that brand, they may not be able to offer you what you need, instead they will sell you what you want, the specialty guru may be able to offer a wider range of equipment, maybe even the same as the big box and generally is armed with much more info on what you need, not what you want. Trust this person to do it right, he has your best interests at heart.