Well, the good news is that you can end out even in a suspension swap. I would bet that if you post in classifieds, you might find someone who is willing to do an even swap for their low mileage stock suspension for your suspension. It would have to be from a TDI because of the engine weight differences.
I wouldnt' swap out the sway bars because they don't have much affect on straight and level ride comfort.
I'd go with the easiest solution first though - get light weight 17" wheels with one size taller tire size which would be 225/50 tires. One of the VW Jetta TDI cup edition cars in the buyer's guide had the same wheel/tire combination so I know they fit over the brakes. Just make sure the offset and width are correct. VW wheels are pretty heavy so lightweight wheels will also help a lot by reducing unsprung weight.
I wouldnt' swap out the sway bars because they don't have much affect on straight and level ride comfort.
I'd go with the easiest solution first though - get light weight 17" wheels with one size taller tire size which would be 225/50 tires. One of the VW Jetta TDI cup edition cars in the buyer's guide had the same wheel/tire combination so I know they fit over the brakes. Just make sure the offset and width are correct. VW wheels are pretty heavy so lightweight wheels will also help a lot by reducing unsprung weight.