I ran a TSHTF knife thread about this just last week and RD series seems to do very well. In fact, my RD7 arrived last week, thank you very much Justin!! Mine is a flat ground and if it hadn't rained all weekend, I'd have been chopping down weeds that look like trees. I've bought other knives, but this one just screams to be used! IMHO, if I'm in a situation where this knife couldn't get the job done, I'd have a hell of lot more to worry about than not having a blade. And probably should be running like hell.
It balances pretty well in the hand (just a tad bit blade heavy which I consider normal for this blade type, size, etc.) the grips have no rough edges, etc., blade edge feels good, and it came with a very nice sheath. On top of all of that, I'm pretty much a newbie and Justin was great! Quick, concise, informative, emails and if you can dream up the modification to the edge, etc., he'd be happy to do it. Call the others on your list and let me know how quickly they reply and how accomodating they are.
In fact, don't call them, just order their knives instead and stay away from Ranger. That way, Justin won't be bogged down with work when I order my next RD ; )