Have used the Alpinestars Tech 1-ZX for the last few seasons. Very comfortable, would highly recommend them or any other brand that has all external stitching.
The grip patches on the outside are much grippier than leather when handling a suede rimmed wheel; also grippier on regular plastic/leather wheels.
If I was to upgrade I would probably try the new Adidas Adistar Race Glove (only available from Demon Tweeks UK if my internet research is correct); similar concept - as worn by Dale Jr!