I've played Rio Grandes in a couple Robin axes at a local shop. They were nice enough, but not outstanding in the field. Haven't had a chance to put them through their paces in an ensemble setting, however.
Never heard of the Smit product before.
I am always happy to promote the wares of Roadhouse Pickups, one of our brothers here on the forum - he goes by TroubledTreble here, and also has a website at http://www.roadhouspickups.com. He makes great custom wound pups at a very reasonable price.
GFS Neovins and Trucoil pups are a great buy too - they compare favorably with noiseless single coils available at any price. Don't let the shockingly low made-in-China pricetag scare you off.