Yeah i think the RS is a great choice but your right about people overvalueing the five.
They were £4200 new and came with X1 11 speed, pikes, stealth reverb, flows on pro2’s, Raceface SixC carbon bars, etc.
I’d say £1500 was undervaluing it! You’d get more splitting it.
(Jamie 2015 bent top tube Five RS owner)