I have seen some 17-55mm for about $600-700 but they look alittle rough . So I am not to sure if its worth getting a new one and taking real good care of it with a filter or just wait till a nice one comes around.
Canon started instant and mail-in rebates on several lenses today. The 17-55 now has an instant rebate and can be had for around $829. Several stores have 4% rewards on top of that, so the effective price is around $795. Now is a great time to pick one up!