Windows are easy to fix. Get you some spray lithium grease and spray it down the tracks and 'voila. The parts group shows to have a black power window switch for $25.
Linkie
The sprak plug wires, as you know, are bad about breaking down and arching against the head. That would cause the car to seem weak, if you are only getting spark to three of the plugs.
If you need to replace the valve cover gasket anyway, I would consider going ahead and doing the timing belt at the same time unles you know for sure how many miles are on the timing belt. I am parenoid that way, seeing all of the mid '80s BMW's that came into the shop with bent valves and all. :drive: