JC Whitney 7" Headlamp Conversion?$45.99

The first upgrade to do is headlight relays, for just the reasons that 64dartwagon said,"It takes a lot of stress off of your headlight switch, and bulkhead connector. One of the larger causes of dash fires." also its a must for any other lighting upgrades. Just doing the relays will make your headlights brighter, I got another 1.6 volts to my headlights even that made a big difference.
Check this out for more info about lighting and relays
http://www.danielsternlighting.com/tech/relays/relays.html