I think the gearbox is gone on my VRS 2002, stinks like gearbox oil and the underneath is dripping with it, what my best options regarding replacement. Have people brought used gearboxes or do I get it repaired if that's possible, do I replace the clutch and flywheel whilst the gearbox is off. Any help would be appreciated 

The choice is a rebuilt box or one from the breakers. It's a no brainer to change the clutch while the box is out, Inspect the flywheel, if it's a solid flywheel and not scored leave it be if it's a dual mass it might be worth changing.