The London fixie site (or also on ebay) has a spacer kit just like the surly one but that costs £10 instead of £25. Add a wide based cog from on-one (only a good idea if you want some other stuff from them as the postage costs are high) and you'll have a good kit. Not sure about tensioners except from my experience of the surly one. It had great reviews but I found it wasn't very reliable. Worked ok fo a while but then the hole where the spring locates stripped out. I might have been running the tension on the spring too high though.
The London fixie site (or also on ebay) has a spacer kit just like the surly one but that costs £10 instead of £25. Add a wide based cog from on-one (only a good idea if you want some other stuff from them as the postage costs are high) and you'll have a good kit. Not sure about tensioners except from my experience of the surly one. It had great reviews but I found it wasn't very reliable. Worked ok fo a while but then the hole where the spring locates stripped out. I might have been running the tension on the spring too high though.