Looking for some memory...which one thou?

I want to get a gig kit my current 2x256 doent seem to be nuff memory for games like Battlefield 2. I use my PC mostly for online games. Current setup is MSI K8T Neo2, AMD 3200 overclocked 10x240 @800ht runs great no issues. I had my eye on OCZ last time and Mackanz helped me out a few times in the past. *me tips hat to Mackanz I dont know which gig kit to roll with. Here are a few examples

1.) OCZ Enhanced Latency 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual Channel Kit System Memory Model
# Cas Latency: 2
Features: Mirrored Platinum Copper Heatspreader
Heat Spreader: Yes
Manufacturer Warranty: Lifetime
Timing: 2-3-2-5
Voltage: 2.6V
# Model #: OCZ4001024ELDCPE-K
# Item #: N82E16820146896 139.97

2.)OCZ Gold Series 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual Channel Kit System Memory Model OCZ4001024ELDCGE-K - Retail
# Cas Latency: 2
Heat Spreader: Yes
Manufacturer Warranty: Lifetime
Timing: 2-2-2-5
# Model #: OCZ4001024ELDCGE-K
# Item #: N82E16820227211 143.55

3.) OCZ 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual Channel Kit System Memory Model OCZ4001024ELDCGEVX-K - Retail
# Cas Latency: 2
Manufacturer Warranty: Lifetime
Timing: CL 2-3-3-8 at 2.6V, CL 2-2-2-8 at 3.2V
Voltage: up to 3.2V
# Model #: OCZ4001024ELDCGEVX-K
# Item #: N82E16820227204 144.53

4.) OCZ EL Platinum Revision 2 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual Channel Kit System Memory Model OCZ4001024ELDCPER2-K - Retail
# Cas Latency: 2
Heat Spreader: Yes
Manufacturer Warranty: Lifetime
Timing: 2-2-2-5
Voltage: 2.75V
# Model #: OCZ4001024ELDCPER2-K
# Item #: N82E16820146890
# In Stock 168.33


I allways hear positive things on OCZ especially on the last one Plat Rev 2. Seems like #2 the gold series is bout the same, what is the difference between the gold and plat? What is Unbuffered? I want to get as much performance as I can out of the memory. The memory I have now doent like to be pushed beyond 240. I'm curious to hear about some overclocking results some of you guys have had with OCZ. Thanks in advance