Woodsy brought up some good points in a very light hearted way. The type of flying you want to do will determine what type of glider you need or want.

Do you want to fly slope lift?
Do you want to fly thermal duration?
Do you want a glider that can be self propelled to altitude?
Electric or gas?
Do you want to fly hand launch gliders?
Do you want to fly speed or combat?
All of the above?

All of those questions have a direct bearing on what type of glider you need. Try to locate the "League of Silent Flight" website and get what information you can there. Look though all the major R/C magazines and get all the info you can there. Then get back to this arena to ask more specific questions regarding your topic. It is so broad and encompassing that to answer it would require a week of keyboard work by someone much faster than I.

Don't drink beer, send Mountain Dew.