I would really like a macro lens after seeing some of the stunning examples posted recently. I can't quite stomach the £380 cost of the 100mm Canon (no matter how much i'd like to! it does look fantastic). What are my options for ~£200? Is the Canon 50mm f/1.8 and a set of extension tubes a good option? Both the canon and sigma 50mm macro lenses come in under £200, don't know if these are any good though. What are your thoughts? Should i just hold out for the 100mm canon? Camera is a 10D by the way.