I have a few options 150mm Sigma EX which is great for larger insects etc, a 90mm Sigma macro that seems to be not extending at the moment so may need fixing, some Macro bellows with a 50mm enlarger lens and a 35mm lens, and some tubes "eBay" cheapies and a reversing lens.
I'm really interested in some extreme macro shots but as I say I'm having problems with the focus Except the Sigma 150mm which is a fantastic lens in my opinion but only stretches to 1:1 so I can's see the whites of their eyes with that one