What's your budget? You can get
Adorama Flashpoint strobes that are something like 120w/s-150w/s for $100 each. It's
Adorama's brand and they're a great company to deal with.
Cowboy Studios is just bad news all around. They have something like a 30 warranty on their strobes while any other brand I know about will have at least one year. In fact, there was a guy complaining about how they wouldn't replace one of his Cowboy lights that caught fire the 2nd month he owned it. And not to mention the blatant trademark infringement on the Strobist brand.