After taking into account the advice from folks here I've decided to give Schwalbe Marathon a go. They sound bomb proof. I average 1 puncture every 20km or so at the moment. Apparently there are two different marathon tires, Original GreenGuard and Marathon Plus. I found that greenguard is from recycled material but what about real life performance? Has anyone had both tires? Which one is better/more puncture resistant? I'm not after the speed, just to minimize puncture. LBS doesn't have any so I have to mail order, just want to get the right ones.

Thank in advance!