Got my modem etc direct from sentech, unbundled package, in regards to equipment,
1 * 60cm Dish from ellies electronics (retail R190 I think)
1 * 2.5GHz Yagi from poynting 9db alone, 21db when mounted on dish (R200)
Webb industries made up the pigtail, and I also purchased 10m LMR 400 from them, +/- R40 per metre.
Don't forget earthing cable, R2,50 p/m from Mica Rivonia
You can get all these things bundled together, from poynting Or andrews antennas, or Miro, I just made it up, for a fraction of the cost, coz I already had the dish lying around.
Search the forum for andrews, theres many links to aerials that have come through this forum over the past few months, for more info, try
http://www.justf*ckinggoogleit.com
(Replace * with a u)
I recommend everyone checks this link, its a good laugh .
Before going ahead, I called PowerBand, they gve great service, and are also resellers, they came out and did a signal test with an aerial similiar to mine, but I think they use a 45cm dish.
cost R150 if I recall.
For my honest opinion, wait a few weeks, and see if things improve, before signing into contracts, the next year will bring many new options, you don't want to be stuck in a contract with a connection that sucks, if better options exist!