Currently I am riding on 32 mm Hutchinson Acrobats. I think the 32 mm tires and the Acrobats are a little nicer to have than the 28 mm Vittoria Zaffiro's that came on the bike. The choice of Hutchinson was really driven by the chance to have my last name emblazoned on my tires however. I think that Hutchinson makes some very good road/MTB/cyclocross tires but their urban/trekking tires are a little lackluster, in my opinion. I'm in the process of getting new wheels with wider rims because I'd like to try 38 mm tires. Vittoria makes a couple of touring models with high efficiency 127 tpi casings and their puncture resistance systems, the Randonneur Pro and Randonneur Hyper. So I am thinking about switching to those when the new wheels get in. The Hutchinson Urban Tour is another possibility. It has their puncture resistance system but it has a 33 tpi casing, I believe. I don't really know how much difference the casing thread count makes but tires are cheap enough that I might give the premium tires a try and I lean towards Vittoria because the Zaffiro's worked well, they were just narrower than I wanted.
If you are truly road riding pretty much exclusively then 23 mm tires are fine. There are tons of excellent 23 mm tires out there and if you want to hedge your bet slightly you could go with 25's since many of the better models are available in that width too. Once you get to 28 mm and above your selection of high efficiency tires constricts severely and the really high tpi casings are not offered above 25 mm. As I say, Hutchinson has a good reputation in road tires as do Vittoria and Continental. Schwalbe has an excellent reputation in tires in general. I have them on my folder and I think of them as a balloon tire maker but I presume they make road tires too. If you want road tires you should search the road bike section of the forum. I have to believe that this has been discussed so often there that you would be shot for asking it there again but you can probably find lots of good suggestions there by searching.
Ken