Hi I am from Malta and presently I am riding a Bianchi 750 SF Mountain Bike. I am getting a new one and am trying to choose between a Trek 4900 and a Garry Fisher Tassajjara. I am quite a heavy rider (90 kilos) and I like to ride in the rough, however I use the bike on uneven roads mostly. Any suggestions please? Am I choosing along the correct line or not?