Check out this review from fellow A'goner, Petsound. He is doing something very similar in a small room (8 X 12) and with vintage receivers (10 wpc).
Polk floorstanders review .
As for the Rega R-3, I am using Rega Ara's (now R-1) in two of my systems. The smaller system is powered by a Prima Luna Prologue 5 tube amplifier (36 wpc).
Even as small bookshelf speakers go, the Ara's have decent bass. If you are considering cranking up the 70's hard rock to normal 70's listening levels, consider an amp with some balls, as well. If space is an issue, think integrated or receiver. The Outlaw RR2150 ($600) has juice to spare at 100wpc. I just heard the new SONY DA 5200 ESHDMI HT receiver ($1500) and was very impressed with its audio sound.
Regards, Rich