Congratulations on your new camera! - The Canon 70D is in my sights too, though I have a 60D since summer 2011 and don't want to replace it so soon.
The main point is, that the AF has improved significantly in the 70D.
The best thing in both is the articulating screen, wouldn't want to miss it ever.
If you have any questions, here is a very nice forum for all things Canon photography:
http://photography-on-the.net/forum/index.php
Good luck!
PS: The expensive thing about (D)SLRs is not so much the body, but the lenses and stuff: Gear Aquisition Syndrome
