T O M: I have a bunch of Leupold 6.5x20's on a fleet of Varmint Rifles and I find they suit me to a "T" on all manner of Colony Varmint Hunts - and they work pretty well on predators and night calling at the lowest power.
I am constantly on the look out for (and buying!) used Leupold 6.5x20's.
They are a bit scarce on the used market because, I think, they work so well folks hate to part with them.
The last three used scopes I have bought in the last couple of months were two Leupold 6x18's (both "Target" models) and a Weaver V-16 with fine reticle (no dot - dang!).
During the shopping for these scopes I came across NO good deals on used Leupold 6.5x20's!
Keep looking, they are out there, and they are "worth it".
Good luck.
Hold into the wind
VarmintGuy