most rebuilders will have a used set already done for your sled pretty cheep .
Buying cheap shocks seems counter productive regarding your goal of maximum possible ride quality. I like the idea of buying used rebuildables and having them rebuilt. It's nice knowing exactly what you're dealing with instead of mystery shocks.
I recall years ago an aquaintaince that joined us on a trip north needed a new shock for his older mid 90s sled. He decided to be cheap and buy a hydraulic, non-pressurized shock. Not even 50 miles into the ride he had to stop as he had no damping. The shock was very hot to the touch. The sled wasn't really ridable in that condition (very easily bottomed) so he had to limp it into town.