I don't think any one will be able to tell you if you would be craving FF if you got the 7D.
I can tell you my own experience.... I thought I would be fine with the crop on the 7D, seeing as I wanted to get into shooting video. Being able to shoot slo-mo was appealing to me.
What I have found, is i'm not shooting as much video as I thought I would and my focus has shifted to saving up for a FF. This has nothing to do with the performance of the 7D or my liking of it. At the time of purchase I was already spending a decent amount of coin, and sometimes I wish I went all the way.
Either way both are great cameras, and IMO the 7D does pretty well in the higher ISO's
If I were you I think my deciding factor would be what I had already purchased for glass (ef/ef-s) and what I saw myself shooting in a year or so.
Best of luck.