Lens for street photography

I have the itch to buy spend more money on more things I don't need. I am wondering if the 50mm or the 65mm would be the way to go as a versatile lense for street photography, group shots and occasional landscapes.I'm leaning more twards the 65mm since I've heard of some people use it for group shots. I will be using it on an rb67. yes I know it's heavy but I work out and I don't remember the strap I have but it makes the camera feel like 1/2 the weight. I've taken it hiking in Starved Rock State Park and it wasn't too bad. Any advise would be great,


Thanks,
Magoo