I just had one built last year. Here is the progress in pictures from start to finish:
Scoob's new Deck
After much research and pondering, I let my contractor talk me into going the pressure treated wood route. It was significantly less money and his preferred material (he has built a few with composite, but personally didn't care for it). For me, it came down to simple economics. The material cost of the composite was so much higher, that even if I hire (read PAY) someone a couple of hundred dollars to re-finish my wood every 3-4 years, I will still be money ahead 20 years later (I ran the numbers, but don't have them here at work).
I *DID* get very good deals on the PT wood as we built it in the "off season" here in the northeast. You have to ask yourself if the "low maintenance" convenience is worth the extra $$. Don't be fooled by claims of "NO maintenance", as that is BS. Composite decking still needs to be periodically cleaned to keep up its appearance. You won't have to re-coat it with sealer/stain like PT or other real wood, but you'll pay a lot for that convenience.