Hey Light!
First things first...Guitar Repairer, Repair Person = Luthier (assuming of course he/she has skills and is deserving of the title), see also;
http://en.wikipedia.org/wiki/Luthier
Just giving props to the folks that really deserve it. I fix my own guitars and set them up but when my favorites need TCL or something beyond a set up, a Luthier is where you want to go. The kid behind the counter at Guitar Center or the "tech" at the music store usually isn't the person in a case like yours.
I donno man, as far as I'm concerned, the neck IS the guitar when it comes to electrics but the techs (HEY LIGHT!...you out there?) might have a different spin. I have necks that have moved from body to body because I like the way they feel and the way they sound (electrics that is). A bad neck will never make for a good guitar. Not to say they can't be fixed but what's it worth to ya?
I'm not familiar with the unit you're looking at. If it's a solid body, I'd walk away and forget the neck replacement. I play them...I don't collect them...well I do but not for investment purposes. Consider this, a neck and a set up will set you back a few bucks (maybe a few hundred), what's the guitar worth anyways?
If it's a hollow body or semi hollow...maybe...maybe if the guitar looks like a keeper and the price was right. It would have to be "right" with a crack in the neck and all. But then again, if it's a keeper/collector so much for the serial numbers and all that collectable original stuff and then you go and replace the neck...bye bye investment.
Sorry, no help here. What do I know?! Just think of this as a bump hoping to get Light's attention.
I know one thing for sure...don't put epoxy in it...just don't!