I have a chance to buy an M2, CLA'd in February 2012 by Youxin Ye, with a spotless Canon Serenar 50/1.8 (black and chrome) with a B&W UV filter, front and rear caps, and the M adapter ring for $790, would everyone agree that this is a fair price? It'll be my first Leica and I don't want to make the wrong decision...