$600 is probably around the right price for that kit. I'm guessing this is the Standard Press, which is an early version of the Tech III. Indeed, I doubt the 105mm Xenar will cover 4x5", unless this is in fact a 6x9cm camera or you meant to type 150mm. A 150mm would be a normal lens for 4x5". Are any of the lenses cammed, so you can use the rangefinder? I find the rangefinder a real attraction of the Technikas, and while Technikas are real precision instruments and are built like tanks, there are plenty of cameras that are easier to use, lighter, and are in some ways more versatile, so I wouldn't get it unless it had at least one properly cammed lens. The serial number of the lens should be on one side of the cam, and the serial number of the camera should be on the other side, and with a camera that old, you definitely want to check the focus in the rangefinder at a few different distances against the focus on the groundglass with a loupe.