The first question that comes to mind is... Why? What, exactly, do you expect FF to do for you? Unless you are making big prints... really big prints.. you are unlikely to see much benefit from full frame.
The second question is... What do you shoot, mostly? If it's mostly stationary subjects, the 5D2 will be fine. But, if you shoot a lot of sports/action subjects, the 60D would be a better choice for it's more responsive, better tracking AF (7D would be better... and 1D series even better yet).
As to some of your other concerns, if you have good reason to make the jump to FF and the camera's AF performance isn't a hindrance...
1.) Get the right tool for the job, whatever that may be.
2.) Why would you let the 70-200 go? It's every bit as good on FF as it is on the cropper.
3.) Why let the 35/2 go? We all feel differently about focal lengths. Personally, I wouldn't use a 35mm lens on a cropper, but it's one of my favorite focal lengths on FF. Conversely, my 50/1.4 sees the most use by far on my crop cameras, the focal length makes me yawn on FF (tho I use it when it's appropriate, of course).
4.) An ST-E2 module is small, lightweight and easily slips into the 5D2's hot shoe to give you better wireless flash control than the 60D can do with its built in control. The module also can provide focus assist, in low light situations
5.) AF... see above.
6.) Weight... well, can't do much about that. With FF both the camera and the lenses will be heavier, and in some cases bigger... and often more expensive... Sometimes a whole lot more expensive. That's just the nature of FF... Lenses have to produce a larger image circle to fully cover the bigger sensor... And, as you know, focal lengths perform differently. For example, if I want to get the same reach I'm getting 300/4 IS on my 7D, which is pretty easily handheld, with my 5D2 I have to get out the 500/4 IS and a sturdy tripod.
IMO, 5D2 is good to about one stop higher ISO than 60D... And 5D2's AF system can continue to focus, tho pretty slowly, about 1 EV lower than any of the current crop cameras (including 7D). So 5D2 might be more ideal for low light shooters.
I am not saying "don't do it"... Just pointing out some pluses and minuses. Go into this with your eyes wide open, not clouded by all the things you've heard. There's a whole lot of hype about "full frame goodness".... some true, some exaggerated. At the same time, crop cameras are made out to be worse than they are. A FF "upgrade" won't magically endow great skill as a photographer onto anyone.
FF might be ideal for some folks, while for others it's a waste of money or even detrimental.
So consider what you really need to shoot and what your end results will be, to best decide.
I shoot with both crop and full frame cameras - currently 7D and 5DII - using them for different purposes. On average I shoot about 10X as many images (around 50,000 a year) with crop as I do with FF (roughly 5000 a year). I prefer the combo of 1.6X crop and FF, instead of 1.3X crop (1D series).
Lens choices...
I agree with the upgrade from 50/1.8 to 50/1.4.... Besides the physical differences in size and materials, AF performance is probably the biggest difference you'll notice... It's faster and more accurate on the f1.4 lens. There are relatively subtle image quality differences, too... the f1.4 lens is more resistant to flare, so gives better contrast and color saturation.... and gives nicer bokeh thanks to an 8-blade aperture (vs 5-blade). One suggestion, If you get the f1.4 lens also be sure to get the matching lens hood and use it. The AF mechanism of the 50/1.4 is a little fragile, the hood helps protect it from accidental bumps, both when in use and when the hood is reversed for storage.
I'd be careful about swapping out the 17-40 for a prime. Depending on what you are shooting, a zoom can be essential. Personally I prefer primes, the 28/1.8 is one I use and recommend... but it's not a substitute for a zoom in some situations. The only thing, if you stick with a crop camera, you might want to consider a Canon 10-22 or Tokina 12-24 or similar.
The 100/2 will be nice on either. Personally I use 85/1.8 and 135/2 instead, but the 100/2 is a good alternative to that pair of lenses. I only got the 135/2 a couple years ago, at the same time I added the 5D2 to my kit. For me it was an "essential" lens with the FF camera, but not something I needed with crop. Again, we all have different needs and preferences for focal lengths.... and that's as it should be.
it's only been a little over a year with me and it has served me really well
. I'm keeping the 60D though for wildlife/sports stuff though. It is very versatile with that 100-400 lens that I would just hate to miss the range that I have with it
