You won't regret the 50 at all. The list seems to be of the opinion that the M 50 f1.4 is the "least" of the fast 50s, but they're all very good. And with the M, you still get a good build (the F has a pretty bad build).
Henri Toivonen wrote:
snip....
I will try to get that 50mm atleast, and see if i have the spare money to buy the 135mm.