Don't underestimate field pup

It is not so tough (no surprise when you compare stainless steel and carbon steel) as swamp rat, but it's also way cheaper.
I have a field pup and it is good knife, but you should specify what you intend to do with it. It is not a chopper (and blade is only 10cm (4") long, so it wouldn't be easy to do

) or prybar (if you look at images, it is quite thin, 3mm blade thickness is only at the top of blade - it is because of high grind), but it is quite good for cutting purpose, because of thin blade. AUS8 is nothing special, but for the price and use it is enough.
Balance point is roughly where your index finger will sit (with hammer or saber grip).
Handle is (for me) very comfy, lack of guard is not a problem because of the shape of handle, you don't have to worry that your hand will slip on edge. It is very secure to hold even with wet or oiled hands (texturized surface).
The main problem of this knife is it's sheath which is quite rubbish. Too big, very simple (the belt hole is not buttoned so you must take down your belt to get the sheath at it) and the leather inside the sheath has no finish and you will often find a dirt (from leather) on blade. Sheath has no locks but it is tight enough to hold knife upside down.
My opinion: for it's price (I got mine here for about 56$, but for instance NGK (
http://newgraham.com/sog.htm ) will offer it for 38$) it is VERY good knife.
P.S: and avoid SOG Field Knife (
http://www.sogknives.com/x42fk.htm ) - it's little bit bigger (13cm blade I think) and has better steel BUT it is balanced like a chopper (which it isn't), it's also heavier AND it has same rubbish style sheath; btw it's also discontinued