Sounds like a good option. Myself I would trade both in. Get the GSA and make the second bike a more severe dirt machine. Or just a smaller Scooterish ride to wander around town with. The idea to me is not to have 2 vehicles so close to each other. A GSA and a 450x is a nice combo. Or an F800R. Myself I am cheap. And not brand loyal. My second trail bike would be one of three bikes. DRZ400s, XT250 or another TW200. I am not a motorcross guy. I just wander offroad. And I like little bikes to play in the snow.
Screw this shit. I'll meet you there.....