Truth be told, your only real options are what is available. Unfortunately our choices are getting fewer every year, especially if you are looking for radials.
Average prices are going to be in the range of $200 each.
Radial may give a slightly smoother ride if you don't have your bike packed down for a trip, but they generally have a lower weight rating than the bias ply's so keep that in mind as you choose.
I'm in the process of looking for tires for my LT, so far I've only found 1 option for radials and 3 or 4 options in bias ply.
YMMV