Cheers, and welcome to the forum.
Straight up ... I have no knowledge of the GG FSR 4-ts. Dunno what engine the 05 FSR 450 is derived from (maybe Yamaha). The 4-t GG's are a somewhat rare beast from my experience - never seen one in person.
The 09 2-t 250 is a known commodity. Lots of info and parts availability. The engine is pretty similar through to current models. I have a 2010 300 which is not that much different. My bike is road plated for convenience - legallly riding from trail to trail - but it's not much fun on pavement. These are full on off-road rides and not really dual-sport bikes.
Maybe this helps ...
Jason
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