Ill add my 2 cents.... im a huge fan of the 700s. No carbs, no bullshit jetting it. They respond to mods like crazy too, mine has quite a bit of shit on it, but it runs damn hard. For a trail machine the 700 is unbeatable imo, tons of torque, reverse, and fast as hell....
I had a 450 for a while and still liked my 700 better.