Stock Screener

I'm New to Trading Small Cap Stocks on the ASX.  I have been reading: "Exploding the Myths", by Frank Watkins.

He talks about his own software, Pro Tader ( http://www.protrader.com.au/ ) and how he uses it to Scan the ASX for Stocks that meet his certain Parameters.

So far I've Found:

http://www.stockscan.com.au/

http://www.incrediblecharts.com/topic/Stock_Screener

http://au.stock-screener.org/

Has anyone used the above Stock Screeners and do they Recommend One over an Another?

Also I was wondering if anyone has some good Recommendations for Free Stock Screeners?

Thanks!!