A compression fitting is going to give you a more robust and reliable seal than a sharkbite, regardless of what anyone says.
It is also insanely-easy to install -- slip it on and tighten -- so I'm really unclear why you don't just do that yourself... Do you have a sufficient length of copper pipe coming out of the wall? If so, that would be what I would do. We recommend it all the time. You generally need about an inch of pipe minimum, depending upon the particular valve.
Here's a video of a guy installing a compression angle stop. See how easy? http://www.ehow.com/video_2328611_ho...ink-angle.html
EDIT: Upon rereading your post, maybe your point was that it IS so easy that you don't want to pay a plumber to do it. Got it...maybe. Regardless, it should be an easy enough job to do it yourself.