As you've already discovered, you'll get at least as many opinions as photographers asked. Compare prices of similar lenses on www.keh.com before you do something foolish. Hint, you'll want a lens or lenses in shutter, not in Sinar DB mount. 'nother hint, the Ilex is effectively a 65/8 Super Angulon, if the glass and shutter are in good order is worth buying with resale in mind. Everything else listed seems overpriced and I suspect -- haven't checked, its your money, you check -- that the 180 Tele-Arton and perhaps the 240 too are for 2x3, not 4x5.
150 mm is normal for 4x5, more shots are taken with a normal lens than with any other focal length.
Good luck, have fun, educate yourself before spending money,