Another vote for the YN622C. They are easy to use and seem to be very reliable.
A little more unsolicited advice: read some reviews and comments on the Yongnuo strobes before buying. I've seen a number of complaints about some models where, the customer really likes them for a few months and then the flash head blows out. Yongnuo seems to be making a real effort to improve the quality of their stuff, but I'm still hesitant about buying their strobes.
Keep in mind that one of the major practical differences between the 580II and the 430II is the ability to use an auxiliary battery pack. If you get into flash photography much you will soon find that the recycle times of units without a battery pack can become a problem. Nothing more frustrating when shooting a portrait then missing shots because your strobe isn't recycling. Especially if you are trying to shoot kids, pets or almost any subject whose expressions change quickly.
Finally, there is a guide to the YN622C available on the internet that an individual wrote. I don't have the URL in front of me, but if you do a search you should find it. It's pretty helpful and a lot easier to comprehend than the Chinglish that Yongnuo's documentation tends to be written in.
Finally, have fun, but beware. If you think lenses can eat a hole in your wallet, just wait until you start buying strobes. Nobody needs more than one 70-200 2.8 zoom, but when it comes to strobes, you'll soon find yourself with four or five before you know it.