I never use leica slr but I know that you can use the R lenses on canon eos with adapter. And judging from the form factor of the R8 compared to the previous models I don't think the motor would fit (just guessing here) and the elmar should be for the M rangefinder series.
So probably you'll have the body, a 50mm, 35-70, and a 80-200. A solid set if you plan to use it maybe add a wide angle.
For the price maybe you can check keh.com for guide.