Personally, I'd wait for the next iteration/offering. Where you choose to throw your cash down is up to you, and should you buy an X1000 I am sure you will enjoy it. I know I enjoy my SAM a heck of a lot.
That being said, I do find delusional thoughts in the minds of people spending $3000 on a machine that sure, they will use and enjoy, they also may feel it's an investment. I'll eat my hat if these machines ever become collectors items that garner more value than they initially did. It's not an Apple 1, after all. This is not a slam against the X1000 or any other NG offering, it's just a mere observance of the fact that computers (of any stripe) are essentially appliances now.
I would have ponied up the cash for an X1000, but they never offered them in motherboard only form (as ACube does). Should a successor come on the heels of the X1000, I certainly hope they offer a motherboard only option for people that prefer to build their own systems (like myself).