I'm building up a lightweight fixed for the road, based on XACD's Ti track frame, and am wondering what make of chainset to get so that I can maintain decent chain tension. At the moment I have a Miche Primato which has disappointed me by being off-round enough to make a visible difference when I turn the cranks by hand. My basic knowledge of geometry suggests it is the chainset rather than the sprocket. Funds would stretch to a carbon chainset (thanks to a dead aunt) but only in the interests of getting something reliably better made - we aren't talking performance cyclist here! Any suggestions?