another option (often overlooked) is adapting an old steel frameset that was built for 27" wheels. the majority of 27" wheels were used with 32mm (or 1 1/4") tyres by default, with mudguards, so by installing 700c wheels you gain extra 4mm clearance. the trick is to find a decent frame, as quite a few of them are rusted, don't have bottle cage mounts, have seized parts..