New CV's or rebuilt half-shaft?

[amz at eskimo.com]

1988 5000s quattro  ~150k miles

I'm getting conflicting advice about rebuilt half-shafts vs. paying more for
new CV's.  From local estimates, I can get a rebuilt half-shaft for about
$125 or $150.  I can get a pair of new CV's for about $250.

What is the best solution?

I've heard that rebuilds may not be much better than a simple "used,
inspected" from the local Audi/VW wrecking yard.  Are there any mail-order
resources for really good rebuilds?

Please cc: my e-mail in addition to the list since I only get the digest
version.  Thanks!!