Hard Drive Confusion!

Hi there,

I have recently purchased a new HDD for my PC and getting ready for a clean install but am having a nightmare trying to figure out what configuration would work optimally in my setup.

The two drives I have available, currently, are;
300Gb Velociraptor Drive (10,000RPM, 16mb Cache) - WD3000GLFS
3tb Seagate Barracdua XT (7,200RPM, 64mb Cache) - ST33000651AS

Now I am unsure which to install the OS onto. I am currently thinking the faster RPM would be of benefit on the Velociraptor but am unsure?

I am also open to the idea of buying an SSD for boot, a 60 Corsair Force 3 Series is what I had in mind, but am unsure I will see a massive boot time decrease as I already boot very fast from the Velociraptor! Would I see a massive improvement?

Other PC Information;
ASRock Z68 Extreme4 Gen3
Intel i7-2600k 3.4Ghz @ 4.7Ghz
16.0Gb Corsiar Vengeance Ram


Please help! I've looked everywhere to try and figure this out but failing!

If you are happy with the performance of the discs you have, use the WD for the os and if you are into any game(s) you play a lot and often, you can put them there also. Since the other disk is very large, you could split it into 2 partitions. Then you can use one partition for data, music, pictures and other software; while the remaining partition can be used for back ups (I assume you are using Win 7 and it has a back up feature included). I would suggest 2 1.5T partitions or a 1T and a 2T depending on how much data and other stuff you have. I would use the 2T for back ups as you will want to back the boot drive and the data Partition.