Rather than decide 'up front' what you want to put on your walls, or have the Mrs decide for you, how about taking your favorite 30-40 photos and using them as a screen-blanker on your computer. I do just that with my computer at work and it helps me to distinguish between 'pretty good', 'good enough', and 'good enough to hang on the wall'...although I haven't printed any for wall hangings.
Having a 24" monitor at work helps, too. I just ordered the same monitor for home!