the 85mm is dx, (and also a bit slower at f3.5), so if you think you might upgrade in the future to a full frame body it wont work. 60mm is quite a short forcal length for serious macro, your working distance at 1:1 reproduction is a fair bit smaller than with a 90/105. this can be a pain for insects as they are more likely to move with something approaching them really close, and also you can block the light as you get very close, physically start blocking the light out. The longer length will also be very nice portraits.

if it was me i would get this and pocket the $200 difference
Tamron SP AF90mm F/2.8 Di Macro 1:1 Lenses :: Tamron :: Lenses - eGlobaL Digital Cameras Online Store

cant believe how cheap these things are getting.

Cheers