We're looking at purchasing the EOS Rebel XS EF-S 18-55IS, along with a macro lense finally..
Any input on which macro lens we should get?

Any thoughts on:
EF 100mm f/2.8 Macro USM?

any input/experience would be welcome!

I know a decent amount about photography from my B&W SLR Film days, so I am good with photographing as a skill, but have very little experience with macro lenses, and its hard to take knowledge of normal photography, and apply it to photographing coral without trying things out on coral.
Thanks!
Zach