Need Help Buying A New Game King

[speedbump]

I have an older Game King (version 5. something) and wish to purchase a newer tabbed model.  I have been offered a 6.0 at a very reasonable price, a 6.2 for an arm and a leg, and a 6.3 for an arm, a leg and a left testicle.  All have 17â€� LCD monitors and are paper in – paper out. 

I am having difficulty figuring out what significant differences exists between these three models and whether it is worth the price difference for the later versions.    I have tried the search function with no luck. 

There are no dealers in my neck of the woods and the Game Kings that are offered for sale are 500 miles away, making it a 1,000  road trip for me.  This means  I need to do my homework before I go.  This also means any warrantee and programming offers made by the seller will be worthless due to distance, and I will have to take care of things myself.  I don’t know if the 6.2 or 6.3 are less user friendly than the 6.0.

Any help and information your can provide on the differences between the three and which one would be the best for me to purchase under my circumstances would be greatly appreciated.

Thanks,