The MST200s are a good fit for that application. Yes you should use UV rated outdoor ethernet cable, and your local CE should dictate what lightning protection you need, but usually some kind of lightning protection on the ethernet is requested, grounded outside the building (esp if exposed above the roofline).
Speeds over that link will be determined by whether you are doing HT20 or HT40 links, but should be near max speed. Check out the chart from the outdoor VRD (http://www.arubanetworks.com/wp-content/uploads/OMWN_VRD_2012-01-04-1.pdf), which shows you the HT40 throughput rates. HT20 would roughly half that. For the MST200 you want to check use the red 5614-to-5614 plot.
One question, what is the type and number of voice clients that will be running over the link?