No experience with Wista, but I had a Toyo AX. Very good camera, solid as a tank but reasonable weight. Meets all of your criteria. More readily available than Wista I think. Only limitation is a fixed bellows and limited extension. You can still use a 300 mm lens for landscape but not a 450. Certainly enough extension for your lenses (I assume you meant 150mm vs 50mm). On the wide end, you can use your 90mm without a recessed lens board but the bellows are a bit compressed. I would not think twice about getting the Toyo.