Any breed can conceivably dress out at any weight. It's really a matter of how long you want to raise them. I've raised Barred Rock cockrels to about 5 months of age on broiler feed and they dressed at 4-6 pounds. I've raised cornish crosses who dressed out at that in 10 weeks. So, it's not a breed question as much as it is a duration. However, all pure breds will be somewhat disappointing compared to the broad breasted birds we're used to. You'll probably learn to enjoy the tougher stringiness of a full flavored bird is the up side.
I'm just a few weeks form setting my first "home" crosses into the incubator. I'm using a dark cornish roo on barred rock hens and a barred rock roo on cornish hens. I think since I haven't selected certain strains of either breed for generations, I should get some good results.
Commerically available breeds, I've had a lot of luck with my Freedom Rangers (we're doing grey rangers and gourmet black). I still have lost none to disease out of 50, which by this time I'd expect to have lost 10+ cornish x's.