5000 CST: to buy or not to buy?

[Eugene Sokolovski <esokolov@glue.umd.edu>]

Hi all 
  I am new to the list and would like to hear any 
comments/opinions/suggestions about subject .I am 
thinking about buying an '86 5kcst with 127K on the
clock. It's not quattro, but it is 5-speed.The car seems
to be in good shape, and all the electrical works except
cruise control.Yes,it does have a power steering pump leak,
(~ $300 fix) and the owner wants $2000 for it. Does this sound
like a good deal?  I know that Audi parts here in US are
expensive, but I am familiar with cars and have always fixed
my cars by myself. I never worked on turbos though. Are they
much more complex to work on? Are they reasonably reliable? 
Any other "common" problems with these cars? Any comments would
be greatly appreciated.
                      Thanks
                            Eugene