Are you planning on getting the XS8?
The Motif XS8 cost $3200, So What I would do is get a new Yamaha MO8, a used triton 61, and a used XP-80 and you would still have money left over for a new roland amp. Face it, you need to play on something with wieghted keys, and you probaly need something light-weight to travel with. The MO8 Has most of the sounds as the Motif, and you can still have a wide variety of sounds with the other boards. Or if dont have a lot of room, you can just get a MO8 and a triton Module. Unless you are really into synths, I dont think that The XS8 is worth twice as much as the MO8
I really dont know what you are gonna be using them for so its hard to make suggestions