Okay guys. I'm wanting to buy my first Injector razor. There's a ton of the Schick versions on auction sites. What should I be looking for? Adjustable or fixed? And particular models to stay away from? There are some that are new in package with blades. From what I've researched, the older but NIB Schick blades are the best. Does this go for any of the older version? Or is there a particular box i'm looking for.