Camera Labs

I'm looking to buy a monopod to make life a bit easier for me. I do quite a lot of motorsport photography, and use a heavy Sigma 135-400 lens. I find that it doesn't take long for my arms to be aching. I'm thinking of getting a monopod to help combat this, as well as try and make my images a little sharper.
I'm working on quite a tight budget, around £30. I have a head I can use, so that isn't necessary. Can anyone recommend a good monopod for me? I currently have my eye on a Manfrotto 679B that looks quite nice.

Any advice and tips are appreciated

Adam.

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Canon 50d, 50mm f/1.8, Sigma 135-400mm APO, Sigma 10-20mm, Lowepro backpack, Velbon tripod, Manfrotto 679 monopod, Hoya filters

www.flickr.com/amr276
Comment and help me learn!

It's a bit above your budget, but I use the Velbon Pro Pod 7. It's carbon, with a twist lock system. At your budget, a Carbon system probably won't be possible, but look for the twist lock, it works very well!

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I take pictures so quickly, my highschool was "Continuous High".