Hello and welcome.
Follow your heart and get a Monster. They are comfortable and easy to ride. I covered 620 miles on mine last weekend.
As Smiffy said, the high service costs are a myth. An awful lot of stuff can be done at home by an average owner. The 2 valve models are really easy, but the 4 valve models are a little more complex.
Personally I would avoid a 600. The fuel system can be fickle sometimes and it will be the least powerful of any Monster.
A 620 would be a good starting point, having fuel injection and being a little more modern.
If you can get something with a metal tank, rather than plastic you are also ahead of the game.
One of the weakest points of ANY motorcycle is the charging system. No less so on a Monster... Get one and we'll show you how to make that aspect reliable..
