Originally Posted by
icyclist
"how important would a 2100 gram wheelset be vs say a 1700 gram"
OP, add your bike, if it weights 20 pounds with the 1700 gram wheelset, to your 170 pound weight, for a total of 190 pounds.
With a 2100 gram wheelset, you'd be at a little under, what, 191 pounds. That's ever so slightly less a 1% difference in total weight of you and your bike.
Thus the importance you ask about, in practical, everyday riding terms, is nonexistent. Which means the list of choices you want us to ponder over is meaningless. Buy some new wheels, any wheels, ride them and enjoy them.
Actually, it's about 0.5%. (1 lb difference in about 200 lbs)
And yes, it's possible that you'll be able to feel the difference, especially accelerating. I know I can feel the difference between a set of wheels that I have that's over 2100 g and another set that's about 1700 g. It's not a significant difference, though, so outside the mental aspects it's not really anything to worry about.