This isn't a suggestion for a folder for you (for cheap you might look at Cold Steel though, Voyager series) - but the reason that people spend money on knives that they're going to abuse is so that they don't BREAK! I'm not rich by any means, but I spent $100 on an Ranger RD7 because I know that if I was in the woods and REALLY needed it, it would hold up. I'd hate to have a cheapo knife and realize that all of the sudden my life depends on it. I can't afford a $500 Busse at the moment, but those are from what I understand tough as nails, and they are also simply beautiful. So... back to my original point, for my money, I'd rather have 1 knife that I can trust with my life than 2 that I can't, just to save a buck or two.
Edit: CRKT M16 knives are ambidextrious and of pretty good quality for the money.