Jags,
I use Schwalbe Marathon Racers on my ti-framed Eclipse derailleur bike. (Light touring bike, now used for day rides since I have my Raven for touring.)
I use 700 x 35 Racers, and they are very nice indeed -- give a better ride than my 26 x 1.6 Marathon Supremes. The Racers are said to be 35mm wide, but inflated they are 32mm actual.
They are available in 30 mm, which I'd guess comes out at 28 actual -- but you'd need to check that.
In past years, I had good luck with Vittoria Randonneur Pro tires, 700 x 32, which were 29 actual. Also a light tire with a very nice feel. (They're also about half the price of the Schwalbes.) Because they're narrower inflated than their listed width, I'd suggest a 700 x30 if you go that route.
Hope that helps, and that it doesn't just complicate things further ;-)
Cheers, John