PC Upgrade Setup

I just recently upgraded my current setup. I used to have an ASUS P5GC-MX motherboard in my old setup, with 2GB of DDR2 RAM, a 150GB HDD for primary storage (7200RPM, Hitachi DeskStar), Intel Core2Duo Processor (2.2GhZ), nVidia GeForce 210 (512MB) GPU.

I swapped this out for the following parts:

1. ASUS P8H67-M LX Motherboard
- 6 SATA ports, 2 of which are 6GB/s SATA connectors
- capacity for up to 16GB of DDR3 RAM
2. CoolerMaster eXtreme Power Plus 550W PSU
3. Kingston 4GB DDR3 RAM
4. Intel Core i3-2105, 3.10GhZ
5. Kept my current GPU (nVidia GeForce 210 - 512MB), but thinking of upgrading to nVidia GeForce GTX 465 (1GB DDR5)
6. Windows 7: Ultimate Edition (x86), SP1

Any other suggested upgrades?