So to address a few of those questions...
The canon 60D uses SD cards for storage, so there is nothing stopping you from getting a bigger SD card than 16gb. Also, depending on how much shooting you do non-stop through the course of the day you'll be swapping cards no matter what. I shoot with a 7D and even with 32GB CF cards, I will swap out for back up cards depending on how long the shoot is.
Consider this, 3min of 1080 hd video is about 1gig. So on a 16gb card that's about 48min, and if you bump up to a 32gb card that's about 1hr 30min. So I'm not sure what type of shooting you'll be doing, but keep that in mind. Also as long as there is plenty of light you'll squeeze a bit more video per byte out of the camera.
The 60D does have AV out but I can't name a single person using these in the field that is capturing video out via AV. And I doubt the quality would be any good at all.
I hope that helps. The 60D is a great little camera.




