I'm hoping to get a pair of puncture-proof slicks, (i.e. Schwalbe Marathon Plus), but am having a blonde moment in choosing tyres that will fit the wheel.

So I've got a pair of (wide) Kris Holms 29er wheels where the gap between the walls is 30mm.

Can anyone recommend the ideal width tyre to use? Also, anyone recommend a decent (tubed) puncture resistant road tyre?