Well the only experience I have of a macro lens was the Raynox (DCR 250) used with the Fuji. It allowed me to get on top of the subject and that's what I'm used to.
Obviously the fuji isn't in the same league as the 350D (as with lens, obviously), but its all I know.
I don't really want to spend money on a lens to find that I'm frustrated with it a few weeks down the line!
Unfortunately I have to save for my 'treats' so really need to make the right decision the first time round (A hard lesson I've learnt with the Sigma 70-300mm 'macro').
And if there is any change it will probably be spent on a tripod or a decent bag as mine is becoming more cumbersome and annoying by the day......