I have for sale a Walker Titan 4x5 field camera in great condition. Endless movements, super rugged, locks down tight. Come with extra set of bag bellows. 1200.00 plus shipping.
I have a frien that has one of those....truly an awesome camera, especially for those who do architectural photography. I can't afford it or I'd buy it in a second.......for what it's worth.
Unless I'm mistaken on the Wista SP, it's a double extension camera. The Walker Titan is a triple extension. The Walker also has very generous movements for a field camera. They're extremely durable and dimensionally stable. Not to diss a Wista, but the Walker is in a class with a Canham or a Lotus. One of the few cameras I'd even begin to consider trading my Canham for.