if you want to know why plasti-blades do not come stock... you might find some answers in my article =)
http://www.heli-max.net/mediawiki/in..._Plasti-Blades

as far as the blade grips and mixer arms... I recently posted all of that info over in the wee blade cp forum. It's $15 bucks for the parts you need to upgrade, and you can get them at www.horizonhobbies.com

There are all sorts of CNC stuff that is much more durable than the stock stuff... but you'll pay through the nose for it =)