My Juki2010Q has a HUGE throat space... just got done doing a really big quilt on it. It is specifically a quilter-- strong, powerful, FAST and all-metal, no plastic body. Stitches like a dream for FMQ. And it only costs in the neighborhood of $900, just a fraction of what the computerized machines with tiny throats sell for!
http://jukihome.com/products/quilt_tl2010q.html