Flyinsolo11--
The main symmetrical carbon fiber blades run ya around $30.00...In reference to comparison with the stock woodies for weight, not sure as I have no set on hand currently...I shattered my woody set when I first purchased my CPP back in early May, and picking up a TX for the first time on an RC-Heli...I can tell you the plastic ones do give ya waaaay better stability (added weight), but is recommended to change pinion sizes to reduce stress on the stock CPP motor using these. (Flat bottom ones).
Here is a website that talks about the plastics more in depth
http://www.heli-max.net/mediawiki/in..._Plasti-Blades
They do make it very stable...
My very first flight outside back in early October...Well, more like hovering...Lol..This was the first time I took it from my 20' by 20' shop area to getting a taste of freedom. The vid is using the JCS plastic blades. I have 2 sets, white, and black. I have yet to try the carbons outside, still geting used to them as I just put them on. Do keep in mind that the woodies are nice as when you wreck, the blades usually will shatter from the force of a crash, and ya usually get away with only the blades being damaged. The Carbon, and the plastic, because of there strength, usually won't but the force then transfers to the next weaker place on the heli which is usually your main shaft and spindle. When I get a nasty spill, I usually don't even check to see if there bent, I just replace the two components anyway as I've found you still get small bends from these crashes...
http://www.youtube.com/watch?v=flVJNyQmXL0