I had a 1980 chevy truck and went through a few HR conversion,

CUBIE CLONES diamond cuts sold on ebay for around $20

tried angel light ones the best bang for buck and best performance I found was the Hella H4 conversion.

http://www.autobahnpower.com/products.asp?recnumber=422

This is just one source chech ebay and others above is a great price as I remember paying $80 each for the ones I got.

These hellas turn night into day.