i'm all confused about blades

[Rustywreck]

Ok, I'm looking for a new knife. Primary use is field dressing deer - I shoot a lot of deer every year.
My preference is a folding knife with a relatively short blade, about 3.5 inches, that isn't too wide (not talking about thickness of the blade, but from the cutting edge to the back edge)
What I want is a blade that will hold an edge, can be sharpened when needed (i'm pretty good at sharpening knives) and not rust.
In searching for a new knife, I am finding so many different types of steel the blades are made of I'm not certain which is best - even see ceramic blades.
Any help would be greatly appreciated.