I personally wouldn't waste your money on another 18-200mm lens. The Sigma is a decent walkabout lens, I used to have one where the 'macro' was at the telephoto end, and not true macro. Also the 200mm end of the lens is f6.3 so you'll struggle to get a fast enough shot while handholding, even with IS/OS/VR/VC lenses.
My first macro lens was a Tamron 90mm with proper 1:1 ratio macro, so you can get really up close and personal. I'd be looking at the Sigma 105 f2.8 macro which can be had for around £250 from MPB (get all my second hand kit from them).
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