The non IS version of the f/2.8 70-200 is marginally bettter than the IS version optically, and thats why in late 2005, after a lot of careful research, I went the same route as the OP. But before others jump down my throat, it has to be said that the differences are extremely small and are probably only apparent when doing laboratory tests. In the real world I'd be perfectly happy with either.
As others have said, its a very good lens so get out there and enjoy it. IS can be a useful addition, but it's not essential.