Originally posted by herzzreh ...Will manual focus be a pain in the ass?
It depends on how tender your rear end is...truly!
It also depends a lot on how good your vision is and the focus screen. My daughter is fairly far-sighted and even with an auxiliary diopter on K10D viewfinder, she still does not trust herself for manual focus. My vision is pretty good, but I have found that an aftermarket screen works much better the stock screen with my manual focus lenses. The big trade-off with the aftermarket screen is the loss of accurate spot metering at smaller apertures.
There is also this matter of shooting style and type of subjects. Some things are easier with AF, others with MF. Experience teaches which works best with what. Once thing I do know...Manual focus with many AF lenses is not an easy task. Many have extremely short focus throws that make accurate and precise manual focus difficult. At good example is the Tamron 70-200/2.8.
What you might want to do is to get a couple of inexpensive used prime lenses and give manual focus a try. If you don't like it, you can usually sell the lenses for about what you paid.
Steve