I wouldnt get too too excited over it unless you can swing a good deal....
The 650's seem to be the more collectable and many of this generation Triumphs were prone to leaks in the tubes around the lifters, just to point out something to check out.
Like I said, the 750's are cool, but if you are looking to flip it in the near future, I would do my homework on fair pricing. Good thing is, there are a lot of them still out there and a good supply of parts available.