I agree with cheapbuying that it's a good name.
I don't quite agree with the suggested price though.
The domain is currently yours, revsorg, and I wouldn't let them get to your conscience.
They have other alternatives, e.g. as you suggest, fabcs.org which is more appropriate - but it doesn't quite have the same ring to it, does it!
Personally, I would want to sell a name of this quality for $500 if possible, but would probably drop to $300 if necessary, and maybe even as low as $150 to $200 to get that cash and buy a few more domains.
I reckon $150 would be a bargain. If they don't want to pay that much, I think someone will eventually.
Good luck and don't let your conscience be too hard on you.