What are some great non flash sites?

Please recommend a non-dedicated, thyristor-type, electronic flash-gun [used is OK] with these features...?

• I'm shopping for a used, old-school, non-dedicated, thyristor-type electronic flash (to use on a Panasonic G1 and maybe some other cameras) -- I'm looking for all of these features: 1) GUIDE NUMBER: Around 30m (ISO 100) or better [need enough power to bounce flash off ceilings/walls] 2) FULLY ADJUSTABLE HEAD: - Tilt (from forward-horizontal to vertical-upwards) and - Swivel (at least 90 degrees left and right, preferably 180 left and right) 3) MANUAL-MODE with ADJUSTABLE POWER OUTPUT: Full, 1/2, 1/4, 1/8. 1/16 etc. [via a slider or dial on the flash body] 4) MULTIPLE AUTO-EXPOSURE MODES: Should have an Onboard Light Sensor, coupled to two or more Auto-Aperature Modes [automation managed entirely by the flash with the camera operated manually at matching aperature] 5) DON'T REQUIRE TTL-CAPABILITY: Prefer a NON-DEDICATED model, without TTL-capability -- but it's OK if the flash offers TTL, as long it offers the rest of what I'm looking for 6) DUAL CONNECTIVITY: Prefer to have both a hot shoe and a terminal/jack for a PC-cord (for off camera operation via a cord), although this is negotiable 7) FLASH TRIGGER VOLTAGE: Less than around 24 volts, although this may also be negotiable by adding a voltage-dropping interface SOME LIKELY BRANDS? Braun, Canon, Metz, Minolta, Nikon, Nissan, Pentax, Promaster, Quantaray, Starblitz, Sunpak Vivitar, etc I think a lot of these were made in the 70's and 80's, but there may still be some new ones made like this? Thanks for your suggestions, the more the merrier .

• Answer:

  The last I knew, the Vivitar 283 was still in production. It's been the standard by which all other manual flashes are judged since the mid '70s. It has all the features you're looking for except the swivel head. By the way, why would you need a 180 degree swivel? Why would you ever need to point the flash to the rear? <G>