Zero Cool,
For what it's worth: if your budget is R6,000 you should - IMHO - consider building an i5 system. I'm also buying/building a new PC (on a budget of R10,000) and so have been doing a fair bit of research over the past week or two. My feeling is that you need 12-13K (excl. peripherals but incl. VAT

) to do the top-end i7s real justice.
What GPU are you planning to use?
Intel Core i7 2600k Processor-3.40GHz
< Perhaps consider dropping to the i7 2600; although the price difference ain't much. The i5-2500K would be a good choice. >
UniQue 500W ATX Power Supply
< Could be marginal, depending on what GPU you're using and whether or not you're planning to overclock. If you are, then I'd suggest at least 600W. Both Cooler Mater and Thermalright offer quite useful power calculators on their sites. >
The components I'm currently considering for my build are:
Board: ASRock Z68 Pro3 Gen3 (Local importer/supplier up in KZN offering these for around R1,400 although I should probably throw in an additional R1,000 and get something really decent.)
CPU: i7 (Not sure which one; temped to get the 2700K)
GPU: Sapphire Radeon HD 6870 TOXIC Edition
RAM: Corsair 8GB
PSU: At least 600W; will probably go for an Antec-branded model
Cooling solution T.B.D.; possibly Zalman
Case: Something cheap and cheerful and without any lighting...

HDDs, Optical drives and all peripherals (e.g. monitor) already accounted for.