In my experience, best speaker stands are K&M from Germany, no question. I've had mine for about twelve years now, and watched all my DJ friends buy and buy again cheap aluminium ones which invariably buckle and dent. Quality costs (naturally!) but I cannot recommend K&M stuff highly enough.
If you can find them in the UK, then try to buy from a UK dealer, but Thomann nearly always do the best deals.

http://www.thomann.de/gb/k+m_214-6.htm