Suggestions on cooling products and overclocking

I have read what you are saying about building your own water cooling system. However, the affordability puts it out of my range. So, at this stage, watercooling is not on my buying list (but definitely on my wanted list).

Well, I searched for other brands mentioned for the cooling devices available here in South Africa. All that I could find are those mentioned at the top (Thermaltake, Vantec, Sunbeam, Coolermaster). So, can someone just suggest from the list at the top (#1), which are best from those specified (as I want to buy locally).

Then another thing : PC3200 RAM. I hear that I have to at least have PC 3200 RAM to decently overclock. The Corsair XMS and Kingston HyperX are double the price of just regular PC3200 RAM. Overclocking these regular RAM, would it bring such a big problem to overclocking?

Thinking of going to ± 3000Mhz when I have all these cooling, so will the regular PC3200 RAM stand in my way again?