S80 or R?

I am 85lvl, which means that I can use R gears, but and the gears and the scrolls, and in general all the items to upgrade the gears, are quite expensive. That's why I am thinking of buying S-80 gears, until I earn much money to buy R gears. Actually, is this a good thought? I mean, if I use s-80, there will be a huge difference between the dmg with r and s-80? Thanks a lot !