Just posted some pics from 2010 pro worlds on the lemon lake face book page.
The advantage of Lemon Lake is that every thing is in one location. You drive in, park, and you are there for the day. No driving from course to course. Plus you are spreading out volunteer resources.
Valpo is a great course, it should be used. There's no reason there couldnt be a B tier at valpo the weekend prior. Have you seen the DVD for the event ? I do not think I could ever get bored at Lemon Lake.