Get wood. Mine's a "Stabil", Swedish, mail order only from www.stabil.nu. Weight slightly under 3kg, price SEK 2300 (about $300) plus transport. I've supplemented mine with a big ballhead. I'll put a picture of it in the "non-gallery-gallery", with my 7kg Technika 5x7" and 1kg 30mm Xenar on it. Utterly stable in anything less than a hurricane.