Another first glider query.

All my training in a G103. Looking for a decent glass ship under $20k. Looking seriously at 15b or Jantar Std 2 or Standard 41a. Any big differences between the Jantar choices? I get that the 15b will likely climb better in weak lift but the Jantars will dust the 15b when XC. I am 6'1" and have long arms, so a Jantar should not be a problem for me. I know I can't go wrong with the 15b but there is the gelcoat issue... and if I want to get into XC any time soon the Jantar will do better. Comes down to condition of plane and trailer for what can be purchased under $20k. So an opinion about any and all of the planes mentioned would be good with emphasis on the performance difference regarding the Jantar 41a (Standard) and 48-1 (Standard 2). THANKS