I've always heard Lexar, Kingston, Sandisk = good. Pny = bad. Don't know if it is true, but I've had no problems at all with Lexar and Sandisk Ultra II. Never bought any others.
Not saying the PNY won't work. I've just heard that you may have a 'failure' when you can't 'afford' a failure. If the cost saving were great enough, I might go for PNY (or others), but for me, the savings isn't great enough, especially given that I expect to use the cards for quite a long time.