An M3 is a good choice unless you foresee using a 35mm lens, also if you have really good eyesight you don't need the higher magnification of an M3. An M2 is less expensive and has solitary framelines for 35, 50 and 90mm lenses. Either way, you can find good prices on the rangefinder forum (RFF) and from Youxin Ye on eBay.