If you're interested in soaring (Aside: What we do is soaring: gaining altitude without means of a motor by riding gentle, difficult to find rising air currents called thermals. WE DO NOT GLIDE!!! Gliding is falling like a rock with a slight non-vertical component) Soaring is elegant. Gliding is hoping you survive when you land. Powered planes glide. Sailplanes SOAR!) Off my soap box. Always get altitude sickness up there anyway, living down in the soup at altitude 3 meters here in Florida.
And if you are interested in RTF soaring, the Parkzone Radian is by a ways the best ride in town. When balanced correctly, it just refuses to come down! At the factory CG, 63mm aft of the wing leading edge it is a bit nose-heavy. Fly it that way for awhile learning its habits. But then when you are ready, move it back to 70mm. For me that was a truly magical spot, where the "stall" speed is cut in half, sink rates are likewise cut in half and the plane just plasters itself to the clouds. If there is one brain cell capable of addiction to sailplanes, this plane will activate it. It is truly a magical airframe, high lift, fairly high drag so it isn't really happy in more than 10mph winds (you can learn to fly it in much more wind than that), with a power system that can drag it to 120 meters in nothing flat about six times per charge of its 1300mAh battery, it's just too much fun to be allowed in New Zealand!
Unless you don't have a soaring gene to activate. Then you'll have learned something new and can continue your search for radio control nirvana elsewhere!
For a non-sailplane I'm going to buck the trend and push my favorite at the time, the GWS Slow Stick. Sure it's a three channel plane, but it does amazing things, especially with the right power system. I can't seem to put a video in here so check out my Slow Stick on landing approach. I pulled full up, then hit full power into a (where'd you get all his metric rubbish anyway? Hold on whilst I convert) 130 meter vertical climb in ten seconds. https://www.youtube.com/watch?v=n5m1p6WxYqg&feature=channel&list=UL
is the link. You'll see that the Slow Stick rolls quite nicely using only the rudder, don't let idiots tell you a three channel plane has no roll control. You'll see a vertical roll executed to maintain a vertical flightpath about halfway up there. 1200 grams of thrust in a ~400 gram plane will accomplish quite a bit!