Dorber makes a fine blank and they sure stand behind them. I have a few of them and all have performed great. Just my opinion but when building my first rod I would go with a two piece blank. For me they are easier to work with, as to lining up the guides, finding the spline, and so forth.
If you can get to the Dorber plant in Flippin, Jeff or Ray will help you with any questions and guide you through it as much as possible.
Dano