Praise - I'll send you a PM with more hymns and a little story about why each one has personal meaning for me. Some of the stories involve other people and are just too personal to put on the 'net.

Have you thought about medleys?
Simple Gifts and Amazing Grace
Standing in the Need of Prayer and Newborn Again
Two versions of Come Ye Sinners Poor and Needy

The last three hymns are in the 1975 Baptist Hymnal. I'm Methodist, but played the piano in a small ecumenical Baptist church in Alabama for several years. That's where I learned so many of the old Southern hymns. We had a request Sunday once a month, and invariably I had to sight read a hymn I didn't know! My signal to the songleader was to play it through once if I didn't know it. I remember a few that had to be doubled in tempo.

For large group singing, I like Sine Nomine (For All the Saints), How Firm a Foundation, Finlandia (Be Still My Soul), Brethern We Have Met to Worship. The first and last have beautiful descants. I could go on...