krf :
With regards to RAID 1 + 0 …. Should I use 4 x 250 gb or 4 x 500 gb? The games I play are World of War Tanks, World of War Planes, Rome II, Sho-Gun II, Men of War Series. I do have other drives for pictures and documents. I’ll be using SSDs’.
Neither. Get a single 500GB/1TB SSD if that is what you need for your OS, applications, games, etc. and then back up regularly.
RAID 0 SSD's will accomplish little for performance and RAID 1 won't replace a proper backup.
With the money you would spend on 3 additional SSD's you can do a robust backup of your whole system to disk with room to spare.