Not sure if you're looking for a 26" or a 700c tire, but the Marathon Plus is available in a 700x25 or a 26x1.35.

If you're looking for Marathon Plus type protection, but in a sportier tire (700c size), you may want to look at the Durano Plus. Same Smartguard protection belt (not quite as thick). A very long lasting tire, should get 4-6k miles on the tire unless you run over something really ugly.

http://www.schwalbetires.com/durano_plus

The Smartguard protection belt can be thought of as a tire liner embedded in the carcass. This has two benefits.

1) It's not unusual to get pinch or abrasion flats from tire liners unless they are installed properly. It's very frustrating to have a puncture protection system that is causing your flats.

2) Tire liners increase rolling resistance as it is another source of friction in your wheel/tube/tire system.