Cheers Shaun,
Confirmed my thoughts about the first one, on the online system builder I tried it showed a 10-15% strike rate dependent on venue, and a LOT of around 65%.

Those other two was looking at laying the longer prices, but seeing as prices on betfair are usually much higher than, I dont know how it would fair.

Any suggestion on basic filters to try and make any of them lose eve more, but still keeping it high turnover?