Best DDR3 OCZ RAM for a new system?

Looking to buy some RAM for a new system I am building - I am a huge fan of OCZ so wanted to stick with it and looking to get 2x 2GB of DDR3 RAM (PC-12800 1600mhz) but wasn't sure which would be the best choice. Currently I was looking into the following two options:
- OCZ Platinum (Cas Latency: 7) (Timing: 7-6-6-24) (Voltage: 1.9V)
- OCZ Reaper HPC (Cas Latency: 7) (Timing: 7-7-7-24) (Voltage: 1.9V)

The Reaper is almost $100 cheaper ... and it has the heat dissipation things on it, are the platinums really that much better? Is there a better choice price/quality?
Any advice would be greatly appreciated.

Also, when comparing CAS LATENCY the lower the number the better right?
As well as timing (such as 7-7-7-24), again the lower the number the better right?

Thanks,

[Profile]
CPU: INTEL Core 2 Quad Q9450
MOTHERBOARD: Asus X48 DDR3 (still debating on which one)
VIDEO: ASUS/SAPHIRE 4870 (Arctic AccelS1 rev2 with dual fans)
RAM: 2x2G OCZ DDR3 PC-12800 1600 MHZ (Platinum or Reaper HPC)
HDD: 4x Western Digital SATA2 500GB
2x Western Digital PATA 320GB
Case: Full ATX Tower with 5x 120mm & 1x 200mm fans