The cheaper the better.
In the case of woks, the cheapest are definitely the best. Regular old carbon steel woks are always what's used in commercial Chinese kitchens.
As others have suggested, you may do well to find a flat bottomed wok. These work particularly well on electric burners.
Contrary to what they show on the infomercials, you do not want to use a round bottomed wok on an electric burner. Electric burners are designed to work with a pan in direct contact with the burner. Without that direct contact, many burners will overheat and will prematurely fail.
When it comes to smaller woks, I prefer the single handled woks. They're a lot easier to handle than the woks with two D-ring handles. That's just my personal preference.
When you cook, never put food in it until the wok starts to smoke and never overload the wok otherwise, instead of stir frying, you'll be stir STEAMING. The normal kitchen doesn't have a 100,000+ btu burner like a chinese restaurant has or a wood fired cooker like the old chinese home kitchens had. The typical home range has little over 1/10th the ideal wok heat. Most homes have burners with 12,000 to perhaps 15,000 btus. So, you can see you'll need more preheating time and reduced ingredient quantitites to keep from cooling the wok too much.