5kTQ Drivehshaft replacement

["L. Scott Oliver" <SOLIVER@gcwf.com>]

The all-knowing Dieter, my trusty Audi guru, tells me that my clicking
noise is coming from the prop shaft running from the center to the rear
differential.  He thinks that either the front CV joint or the center bearing
(or both) is bad.

Blaufergnugen has whole rebuilt shafts with the bearing and two CV
joints for $500.  Has anybody found a better price?

I remember some discussion recently about replacing the center bearing
with a BMW part.  Has anyone confirmed that this works on a 5kTQ? 
Dave at GPR has a part he claims fits for $50.  Does anyone have the
part number?  Has anybody bought the part from Dave?

Last, if I were to use a BMW bearing and new CV joints, does anyone
know if I would need to get the shaft rebalanced?

TIA!

--Scott