I mounted a Vortex Diamondback 3 x 9 x 40 on mine. I upgraded the scope on my X-bolt and the Vortex needed a home. Basic "hunting" optics may may be bulkier than some other options, but for target shooting at 100 -200 yards they work great. A friend of mine mounted a Burris of the same specs. on his and used it to take a whitetail this year.
But you are correct, options for optics are nearly unlimited. For every optic you like, buy another AR!