In looking at systems that can go from analytical to semi-prep (or full prep), are there any systems you have used that you like? I was taking a peek at the Gilson system (http://www.gilson.com/en/AI/Products/52.69/Default.aspx#.WhWe6xN-qRv), and we've used the Varian modular system in the past (but not sure if those are still available). Any reviews or recommendations would be greatly appreciated!! Thank you!