If you want a 28mm tyre then the Marathon Supreme probably isn't right for you. You may as well go for a durano/gatorskin if you want puncture resistance and don't want lots of tyre volume. If you want something a bit larger (>32mm) then yeah, definitely the supreme.
I've got road rims so 28mm is as wide as I can go. I find it a pretty good trade off between comfort and reasonable speed. How do the duranos/gatorskins perform in the wet?
Cheers, any idea where I can get them in 700x28c? Amazon has them but for £75 a tyre!