I would also go with handbuilt. A customer came asking about the RS80's and we chatted and he asked about handbuilt and we worked out a few different options. to start with the RC80 are 1530g but with skewers you can add 100g.
This has been already suggested, the venreable 32H 105 + open Pro is a good wheel set but built with Sapim race spokes DS rear and laser everywhere else (assuming that the OP is less than 85 kg kitted up) would be 1880g for the pair. With sapim race spokes front and both sides on the rear that weight would climnb to 1950g. Hardly light.
The rim is a good light one at 430g but changing the hub to Miche RC2 would drop 66g from either build. Using Ambrosia Zenith hub would drop at total of 146g over 105 hubs. 105 hubs ~630g and ~£65, miche rc2 564g and ~ £70, ambrosio zenith hubs 484g. All these weigths include skewers. So Ambrosio + sapim laser/race + opern pro would be 1800g total. The weight saving though is at the hub though but would only add £10 to the build.
The built that picks this customers ear up was with Stans Alpha 340 rims, 28H Miche RC2 (he liked the look of these hubs), sapim laser 3x front and sapim race DS 3x rear and spaim laser 3x NDS. This build would be 1600g including skewers. With Ambrosi zenith hubs you can shave another 80g of that but at the hub where it least useful.
This guy is 10stone though. Price wise the same as a pair of RC80's.