Parts numbers / parts ? for head gasket r/r on 1987 4kcsq

[Tom B]

Hi all,
I am getting ready to replace the head on a 87 4kcsq (engine type JT) that 
was severely overheated. While I am at it I am goin to do a basic tune up. 
Here are the parts that I am getting ready to order.

a) part # 035 198 012n head gasket set    us$64.70
b) part # 035 109 119  timing belt        us$ 7.28
c) part # 857 121 403  expansion tank     us$50.99
d) part # 035 121 043  water pump O-Ring  us$ 0.51
e) part # 035 121 004a water pump         us$29.15
f) part # 03-239       distributer cap    us$17.65
g) part # wr7dc        Bosch Spark Plugs  us$ 1.16(ea)
h) part # 04 139       ignition rotor     us$ 4.24
i) part # 069 129 620  Air Filter Element us$ 5.06
j) part # 09 500       Bosch Wire Set     us$46.28
k) used head, I am going to take it to a shop and have it checked to ensure 
it is straight, also I will have new exhaust manifold studs installed.
l)have exhaust manifold checked to ensure it is straight, have planed if 
necessary.
m)I have been told that I will be able to borrow the special tool needed for 
doing a timing belt change.

My questions are:

1)Am I remembering everything needed or are there other parts I should 
replace at the same time?

2)Am I ordering the correct part numbers for my car? I do not have access to 
the family album so I have no way of checking to ensure I have the right 
part #s.

3)Do the prices quoted seem right? Can I find these same parts cheaper? I 
found these prices at http://www.thepartsbin.com

TIA,
tom
Have a good day :-)

current:
1987 4kcsq (new project car :-)
1989 wolfsburg jetta
1996 Jeep Cherokee (only thing I can say about it is it goes anywhere, when 
it is running ;-)

previously owned:
2 82 CGT's (gone but not forgotten)
2 1980 4k's (where I first learned about the Audi Gods hunger for money:-)
numerous volkswagons

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