Dude.... you're in a fabulous place.
You can directly compare each system on your bike and decide which one feels best for your riding.
Use that to your advantage and THEN worry about selling price.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs