The manfrotto 012B and MS7920B get my votes. If you don't like either of those, then I'd consider a large clamp (superclamp-ish) and something like the manfrotto 396AB and clamp to a rail or monitor hook. Actually, it wouldn't be a bad idea to consider pairing the MS7920B & and a clamp/arm setup. That way you can pick either or when you get there and see what sort of environment you're dealing with.