Definitely use one pump, don't even consider a jet pump. Submersible all the way.
I prefer PVC over poly, but that's an opinion. PVC is much stronger than 100 psi poly. If you do use poly, get the 160 psi stuff, stay away from the cheap stuff.
If you want to keep it simple go with one pump/tank at the well site. Get a big tank for storage/surge purposes, and dig the trenches right and make sure you get them deep enough.