Cuiyu and Shui Xian are both good everyday types. Cuiyu is a jade Taiwanese that is grown at a lower elevation and of a different strain than the high mountain oolongs. It's something like a cross between a jade Tie Guan Yin or Huang Jin Gui and a Taiwan high mountain. It's thicker and rounder than most TGY or HJG. TeaCuppa and Shan Shui both have Cuiyu, with TeaCuppa's being this year's harvest. Like most Taiwan high mountain oolongs, it yeilds a good number of steeps; which is something to keep in mind. Many Taiwan high mountains seem to cost a lot for the relatively small amount that you get, but one pot can last you all day.
The less expensive Dancongs are also usually pretty good. These are one of the main things that really got me into oolongs in general. Again TeaCuppa has some good ones.
Shui Xian is a pretty basic Wuyi yancha, and it's not very expensive. Most vendors have it, though I recommend TeaCuppa's (I'm sure Jing's is great as well). It's also a good one to start with if you're interested in getting into yancha. It's easy to get a decent cup, but it can give you a lot more when you really figure out how to brew it. Once you do you'll have a much better idea of how to get similar results from other Wuyi's.
Lao Cong Shui Xian is actually a bit better, IMO, and also not terribly expensive at TeaCuppa.