Spi traders in Oz - help needed

hello everyone

I am interested in trading the SPI directly, and would appreciate feedback from anyone who is currently trading the SPI.

Most particularly:
- is straight-through processing of orders available
- who are the best vendors for market data ?

I am presently trading equities & xjo warrants through E*Trade Power, and watching the SPI via APSPOT.SFD, and would ideally like to trade thru webiress. Something similar would be terrific!

Would anyone care to share their experiences or advice - thanks in advance

cheers,
witchey poo