The reason I don't really want to buy the 17-55 2.8 is the same reason I don't want to buy a "cheap" tripod or flash: I will replace it at some point. As you mentioned a few posts above, I might be able to find a 610 used on Craigslist for cheap and bang, I'm an FX shooter. If/when that happens, the DX lens is useless.

The almost universal opinion seems to be to get the lens, so that is what I will do.
I will try to remember to post a few photos from that lens once I get my tax return and get it.
Thank you everyone for the help and advice. I will go home tonight and practice "following" my kids with focus.