How do you wish to launch your glider? Hi-start? winch? Discus Launch? electric launch?
The first glider I recommend every time is the ParkZone Radian. Either the receiver ready or the RTF.
http://www.horizonhobby.com/radian-rtf-pkz4700
I have a fleet of high end contest planes and my Radian gets lots of air time because it thermals so well. And I fly it on the slope too.