OK first off, installing and RO system under a sink is a cinch, your gonna need some wrenches, pliers, and plumbers teflon tape. You will most likely need to buy some adapters as well depending on what comes with your kit.
No, I can not link TOTALLY to my system, as I customized it. but here is the basics:
http://www.aquariumwaterfilters.com/RODI....da.html
I had an old RO system and I cannibalized a UV filter and the drinking water adapters, as well as the storage tank off of it and added to this one.
I also came into posession of a 12 inch sediment pre-filter and a 12 inch carbon pre-filter courtesy of Phil. (he is so good to me.) I plumbed those in before the RO system because my water is incredibly hard, this will make the membranes last longer.
My system is currently producing water with a TDS reading of 0.02 (total dissolved solids) this is INCREDIBLY clean water, and is far far far to over the top for CP's in my opinion. Why do I have it then? I have a reef tank as well, CP's are an afterthought on this filter, it's primary purpose is producing nitrate and phosphate free water for my tank.
I really like aquaFX, but it is kind of a cadillac system, go on ebay, search for a company called air water ice, and buy a cheapo 100 dollar system and you will be very happy.