As Jerry (W2GLD) said, the XPR7550 is an excellent radio. And unfortunately, as he said, it does not have the ability to add an external antenna, and your current coverage may be lacking. You will probably only hear crickets on that repeater though, especially since he plans to run it in analog, DMR and D-Star (if he can, I am not convinced that it can be done). And, while the analog or D-Star users are using the machine, you will not have access to it.
So you may want to look at a less expensive radio until you decide if DMR is right for you, or just know that the NC PRN system does plan to improve coverage in the Greensboro area if you decide the other repeater is too quiet. But it will not be a priority, as we are currently working on the Asheville area, the Wilmington area, Elizabeth City/Chesapeake and Franklin/Murphy. It may be possible when we move the Raleigh repeater to the tall tower that it will give you portable coverage in your area, but we can not guarantee it.