I have the 37, 65, 110 and 250. The 65 is a fantastic lens that I find is nicely wide but not problematically so in terms of introducing annoying perspective effects. And if you get the M-LA, it's extremely sharp.

However if you have a habit of shooting the front of buildings from street, you might want to consider the 75-shift as it would allow you to get everything in with both a straight perspective and without half the image being road.