I last owned a mountain bike over 20 years ago and am wanting to get started riding again. i am looking between the Trek Marlin 5 2015, [FONT=arial]Merida Big.Nine 20-MD 2015, Giant [/FONT]Talon 27.5 4 (New - 2015) or any other brands in a similar price range. I want a decent brand bike and wonder what components are important to look at .