the avid ball bearing seven is your choice for 160mm road disc brakes... issues to be considered:

most 700C carbon forks with a disc mount are designed to accept 700x35 and 700x38 touring/cyclocross tires on similarly larger rims. example: advanced carbon "woundup" Team X Cyclocross fork, rebranded by Trek as a Bontrager fork.

mounting one on a regular road frame will rake out the head tube angle, as the fork's axle to crown race height will be at least an inch higher than a normal 700C road fork, if you intend to use lightweight 15mm wide road rims (mavic cxp33, open pro, etc), and 700x23 tires.

there's a real lack of road geometry frames that have a rear disc mount on the seatstay. most are intended for cyclocross, with the sort of forks mentioned above. the best example I can think of easily is the Lemond Poprad Disc, which should be available to view at larger Lemond dealers. If not you can find photos of it on the net. The Lemond, being a cyclocross bike, comes with a 48/36 crank. There is a cannondale cyclocross bike that uses the same avid brakes as the Lemond.

REAR HUB SPACING - 6-bolt disc mounting rear hubs are intended for XC mountain bike use, and have 135mm rear spacing. obviously you can't use these on any normal road frames. I think there might be a few 130mm disc hubs, but they're really rare, much more common are 700C aluminum or steel frames with 135mm MTB rear hub spacing.

the avid brakes when properly set up are VERY powerful, on a mountain bike with the right technique it's relatively easy to endo yourself by locking the front brake. it's also a lot cleaner and less messy in rainy conditions... no more black brake crap on your rims and hands when changing pads. it also won't drip black crap onto your office carpets on rainy days, if you're a commuter. it's less expensive than rubber pads, I've gone 5 months, including a lot of wet weather, on one $14 set of avid pads in the front brake. It's a great way to avoid wearing out rims, but some people might be better served by using a separate $150 winter/bad weather wheelset.