wich memory card for 600D

As my new 600D will arrive shortly I'm going to buy the needed accessories, some memory cards in specific. Wich one(s) can you recomend - the question is not about a specific brand, although recomendations are clearly welcome, but more on type, speed, and other specifications I should take care of.

Thank you in advance!
--
...but in the end you know you cannot live without the ocean !