Best telephoto lens for the leica m9 p?

Here is what the site says about that.

From Leica M9-P: Leica M9-P: A rangefinder by Leica with a 18-megapixel full frame sensor, announced in 2011. An M9 with a sapphire-glass screen and no red dot. Specs - Maker: Leica - Mount: Leica M - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 18 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: 2011 - Type: rangefinder Focal lengths on it Full frame ...

From Sensor sizes: What it costs you: - Size, weight and price, especially of the lenses. A full-frame telephoto is much larger than its APS-C or Micro Four Thirds equivalent. - Less depth of field when you want more of it, for macro or landscape.

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