i got an ancient Sigma (Martins, now no-existant, cheaper models) acoustic guitar, it sounds absolutely great acoustic. It has a shadow pickup fitted in the soundhole which really isn't that great, only really picks up top 2 plain strings.
So im starting to play it alot more live and plugged in, mainly down to leading worship at church, and so would like to replace it with something new, possibly a piezo or under saddle design?

any suggestions??