Currently riding with a triple that has 52/42/30 tooth rings and I NEVER use the 30 and only use the 52 when I've got a tailwind or a downhill, or I'm really hammering. (My rear cassette is a 12-25 10-speed) Otherwise, I ride almost entirely in the 42.

I'm going to upgrade my crank and will probably switch to a double, since I ride flat roads in Illinois and really have no use for a triple.
Having a hard time deciding if 53/39 or 50/34 makes sense. The 50 tooth seems right, but 34 tooth seems way too low. Is there such a thing as a 50/39 or a 50/42? Would this result in just a bunch of overlap in gears?

I mostly want to avoid having to constantly switch between big/little up front when riding, and I'm afraid the 34 will be way too low, and the 50 will be too high. Thoughts?