I agree with what many others are saying. The ESEE 5 (RC-5 when I bought mine) is a great knife, but very specialized due to its thickness, and purpose. This is a last ditch, pilot's survival, escape, and evade TOOL with a sharp edge. The ESEE-4, or ESEE-6 compares more closely to the others you mention, and they are great choices also.
Of the ones I own the Swamprat RMD, and the Scrapyard War Dog are my personal favorites and the only Busse kin knives I own. The Bark River Bravo-1 is also one of my favorites, but it is a bit smaller than your five inch requirement, although BRKT it coming out witha five inch version of the knife in the Bravo-1.5. I probably carry these three knives the most out of all of them.
I have a Fallkniven F1 that I keep in my flight bag as it is stainless steel and I don't have to worry about rust. Its a great knife also, and the S1 is on my list also.
All in all for the money, you can't beat the RMD, and maybe even if you don't consider the money it may be hard to beat. Great all around knife.