Dakor, hi. I'd compare the 6.5-20x50 conquest to the NXS.
The conquest line of scopes are the cheap and chearfull Zeis / Hensolds. They are not on par with the S&B PMII's but i'd chose the Conquest over a similar Leupold any day. They have good lenses, from what i can tell have proved to be reliable.
I've often though about the conquests to equip my estate rifles, rifle that i rent to visiting hunters, but the Hungarian S&B's are also perfect for that.
If i was in the market for a scope with high magnification, couldn't afford a PMII, then i would probably go with the Conquest.
Regards Pete