DT8455133-X780
500W Gaming Case
Microsoft Vista Ultimate
Intel Quad Core Q6600 2.4Ghz
Intel Johannesburger LGA 775 Motherboard
2x 1024MB DDR2 667 Memory
500GB SATA HDD
Samsung DVD Writer
Internal 52-in-1 Card reader
8800GTS 640MB PCI-E Card
Keyboard, Mouse & internal modem
Creative Inspire M4500 4.1 Speaker System
This costs R12539-00 at Sybaritic
pre-build, so it is maybe even cheaper to build yourself. I don't know that motherboard but if you can don't get one with SLI...I have found I never use more than one PCI-E slot...it's a waste of money and time.
Now you could easily throw away Vista Ultimate...who needs it for gaming. Also who needs that card reader.
I also don't think RAID is worth it for a gaming rig, unless I am missing the point you only really need RAID for a server. Otherwise for gaming the rig won't last more than 2 years so why worry about your data?
As for a 22" monitor I bought one for around R2000 once from Kalahari. It's an LG and works perfectly for me. Shop around and you will see good deals. Actually I got it for around R1600 because I had a credit with Kalahari...they owed me for a christmas purchase gone wrong.
EDIT: I think the 8800GTS's are generally way too overpriced. So rather change the card...you can get more bang for your buck with a 8800GT or 9 series.