@IanB

What do you think about my current setup in post #2? Should I take out the RAID and go ahead with the three drive scheme you've shown?

Wouldn't it be beneficial to only keep Windows in on drive (say a 37GB raptor), Programs and Games in another (74GB raptor), all other data maybe partitioned in to 2 for frequency of access in one huge 1TB or even a RAID-0ed big volume?