Granite lived outside for millions of years before it was dug from the earth. Most companies offer sealers that last up to 5 years so you don't have to worry about resealing for a while.

What type of granite would provide a contemporary look?

concrete and soapstone are two other options that work great outdoors if you have trouble finding a contemporary granite... Of the top of my head I'm thinking black or dark grey granite. But I typically go for Caesarstone (quartz) in my projects because I find it more difficult to find quartz that fits my clean and modern looks. However, quartz is not the most durable outdoor option, Caesarstone in particular does not offer their lifetime warranty for outdoor use...

For clean contemporary look, you want something with low variation, like these. I assume you are not wanting one of the super speckly granites...

Azul Platino

All of these and many more than be found at MSI Stone but you should check your local slab yard.

Hope this helps!

Dependent on the configuration you might consider large format porcelain tile, some of which can be used in exterior locations. These "tiles" are actually huge sheets and may afford you the desired look. Granite is still the obvious choice, a trip to a major stone supplier (like MSI) will let you see some beautiful slabs.

Depends on your style but I love slate for out door kitchens it indestructible and adds some interesting color but I live in Canada where it stands up very well to our winters

The UV rays of the sun will destroy any sealer or resin in stone. Whatever you pick, it must have neither. You can't even store quartz slabs outside, let alone lay 'em perpendicular to the sun. If you want UV protection and non-stainability I'd go sintered.