I didn't get anything from anyone for my birthday, so I'm saying "fuck it," and allowing myself to buy one or two parts to upgrade my PC. I use it a lot, as I go to school online, and it's also our primary TV, as I have it connected to our TV via HDMI. So what should I really upgrade? I don't have too many problems with the hardware, except the CPU seems to overheat during some games.

AMD Athlon 64 X2 6000 3.1GHz 1MB L2 Cache Socket AM2 89W Dual-Core Processor

ASRock A780GXE/128M AM2 /AM2 AMD 780G ATX AMD Motherboard

Thermaltake Purepower W0100RU 500W ATX 12V 2.0 Power Supply

Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

A-DATA 4GB (2 x 2GB) 240-Pin DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory

SAPPHIRE Radeon HD 4830 512MB