Specialized Hardrock or the Trek steel bike without front shock, those are the entry level. The least expensive mountain bike with bare-bones parts (well actually the hardrock is a nice bike with more than adequate parts). If you can break either one of these bikes it would be eye opening...unless you're falling four or five feet onto the bike but that's expert territory. Also the specialized Expedition fits the bill too but it has more upright handlebars for bike path rambling.