Guys, be careful about which Rega Mira 3 you buy, according to the current manual on their website, they have removed the power-amp-in jacks to shorten the signal path:
http://www.rega.co.uk/downloads/Mira3%20English.pdf, page 7
There are still a lot of used and demo models out there with the power-amp-in jacks, just make sure you get a look at the back panel of the unit you are buying if this is important to you!