I read a review by Cooks Illustrated on blenders recently, and based on their review I'd get another KitchenAid, even though Cooks Illustrated doesn't recommend it, I don't think they tested the latest model. The newer models have an improved jar that won't leak. Unless you blend smoothies every day, then get a Vitamix. You'll burn out every blender under $300 in 6 months to a year.
http://www.cooksillustrated.com/equipment/overview.asp?docid=38417