Out of curiosity, what sort of budget are you planning to have? I get concerned when people talk about doing such a massive trip, but also talk about wanting to do things as cheaply as possible. When you're still at home, its easy to forget just how much it costs to sustain yourself. Being on the road for this amount of time is going to cost you each several thousand dollars. Having a realistic budget is going to help move this trip from "daydream" into reality.