Radio Purchase decision time

[JThiessen]

Ok I need some advice here. I am going to purchase a multi model radio system. I have basically narrowed it down to wanting Spektrum recievers (mostly due to thier small size, and I think I like the DSM feature).
I found one vendor that has brand new DX-3 systems for 200 plus shipping, and at this time includes a second reciever along with the two servos (although I dont know if either of the servos would work on a revo or maxx).
On the other hand, someone locally has a JR R1 and a KO Mars for sale, to whick I could add the Spektrum Module and recievers. He claims that these are better radios, but I'm not sure why they would be. The cost of the KO an the JR would end up being more than just buying the new Spektrum (Module and two recievers would end up being over 200), so I'm leaning towards the Spektrum. I've never even seen a system used other than the stock systems, let alone used one, so any advice would be greatly appreciated.