I'm going to have to go with my Ontario Rat I. It is my main EDC knife. I have been carrying it for some time, and I have put it to many uses, from the usual things like opening boxes and slicing fruit and cheese, to cutting rope and even cutting some tough PCV plumbing pipe when I needed to do an emergency repair, hardware stores were closed and I didn't want to drive 35 miles each way to go home and get my saw.
I hesitate to even call it a budget knife, even though it is inexpensive. I usually think of "budget knives" as Sanrenmu, Ganzo, etc. Just like I don't think of a Spyderco Tenacious or some of the nice Chinese Kershaws as "budget knives".
Ontario Rat I - if you EVER find a better knife for the same or less money, BUY IT! then PM me and let me know. I want one, too.