That's a beautiful bass and kudos to you for the release (that fish is probably 10-12 years old). Obviously, the mount is up to you. 19" bass seem to be where most of the river fish in PA top out at and, if the fish has sentimental value, than a mount would be cool. It may be a long time until you catch a bigger one (in two decades of FFing PA rivers I've never caught a 20" SMB).
I loved fish mounts, esp when I was your age, and taught myself taxidermy.
Replica mounts these days are usually more expensive than a skin mount. Almost all taxidermists who do fish use pre-cast fiberglass fish "blanks" and the blank for a fish like yours would be about $50-$100 and you may need to add to this the typical $10-$20 per inch taxidermist fee to get the fish finished.
If you decide against the mount, get a nice framed photo, 8"x10" made up and matted with a shadow box where you can display the fly you caught him on.