Welcome to Healing Well! A few things come to mind from reading your post. First, have you had an endoscopy? There is such a thing as "silent GERD", in which you're getting reflux without being aware of it. If that's the case, you may have esophageal damage and not know it. If you've got a hiatal hernia and haven't had an endoscopy to check for reflux damage, it seems as if it would be something to consider before making any decision.
I'm not sure if you can get a hiatal hernia fix without a Nissen fundoplication. You would think so, but I'm not so sure. Usually they go hand in hand.
My other concern is the use of mesh. It's common for repairing hernias, but not so common in hiatal hernia repairs because that use is a bit more controversial.
Here's a link for a medical discussion of the pros and cons of mesh with hiatal hernia repairs. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2063450/
My own surgeon (I had a Nissen 3 years ago) said he considered it during the surgery, but decided to just add a few more stitches for strength, because he said, "mesh can create its own problems".
I wish you the best of luck in making your decision.
I expect others will be by to weigh in on the discussion.
Again, glad you've joined us!