Well, if PRS floats your boat why not look at Jack's PRS SE with P90s for sale on this very forum?
http://www.guitarforum.co.za/classifieds/prs-se-soapbar-2009-needs-new-home-*sob*/
You could pick it up for R4k, add on shipping costs and still save some cash on your R6k budget. 8)
Otherwise, if you hang around gumtree a bit and on here, I've seen some Tremonti SE guitars going in your price range! Nothing at the moment though.
Other than that:
- If you like Strats, a Mexican or Japanese Strat is within your price range, 2nd hand stuff of course (although I imagine you could get a new Mex strat or Tele for around R6k).
- If you like Les Paul type guitars, you could easily source an older Epiphone LP for that money plus change. I got mine for R5.5k. You could also go new, but general consensus seems to be that newer Epiphones are not up to the older standards.
- For sheer versatility, I'd go with something in the super-strat space, possibly an Ibanez with single coil / humbucker combos.