You can get fans or heatsink/heatpipe setups that attach to the bottom of hard drives, or you can stick fans in front of the hard drive bays if your case supports it.
Corsair is a great brand of memory. If it was my choice, I would not get the ones with the LED's unless the timings were THAT much better, which I doubt - the extra cash might go to slightly better timings, but I'd bet most of it goes to the LED gimmick.
Speaking of Corsair, I am pretty stoked; I had some "Rosewill" memory, which I think is like Newegg's generic brand. It was 2GB of Dual Channel PC3200/DDR400 memory. Well, it went bad and I had to RMA it. I was informed that they no longer stocked that memory, and I could have a refund for the current market value, or they would give me an equivalent replacement, which just happens to be 2GB of Dual Channel PC3200/DDR400 ram, but it's not generic - it's Corsair XMS. Definitely trading up. My old memory had a lifetime warranty on it, and then they stopped making it. +5 to Newegg for replacing it with some really decent memory.