I own both the PRO2051 and the PRO97, both are useful. The 2051 is a fine scanner for the beginner in my opinion, it's not too difficult to figure out the programming, just takes a little practice. The downside is that it lacks alpha tagging, you better have a good memory if you plan to use all 1000 channels, not including the trunk id's. For the PRO97 you almost have to use software to program it, and shouldn't a beginner to the hobby familiarise himself to the manual operations of a scanner first?
My bottom line: The PRO2051 is a fine scanner, pretty darn good for the money. It's not the best by any means but it will do what you need it to do. If you can hold out for the PRO2055 to come on sale again I would go that route. I can't comment on the PRO2052, I don't own one.
Welcome to the hobby!