Either steel or nylon string acoustic would be fine for solo worship.The thing to watch for with either is that the sound is not too bright on the steel string and not too dark on the nylon string.If you'll be running through a PA system most of the time then I recommend one of these:http://www.godinguitars.com/godina6a12p.htmA Godin A6 is what I use at church when it's just me and a guitar or me w/ the piano. Sounds like an acoustic, plays like and electric and cost around $500 last time I checked.There's also a Seagull A6 that's identical, just a different name on the headstock.