There are a lot of factors that go into sizing. The good news is that we are MORE than glad to give you sizing recommendations and to help you out. We have a few statistics gathering scripts we'll have you run, and then we use that information to do some calculations. If you don't know who you should contact at Delphix, feel free to shoot me an email and I will be glad to get you hooked up with the right person adam.bowenATdelphix.com