Which model/year Jetta?
I did Kumho Ecsta MXs on my VR6, they're just ok. Not a lot of traction, I spin them a lot in the wet. I had some type of sport Dunlop on there before, those were pretty good.
The Yoko AVS ES100s I have on the P-Car are really nice.
EDIT: Use this calculator if you're interested in trying to match the stock tire diameter:
http://www.miata.net/garage/tirecalc.html
JCM