Here's what I used on both Punkin and Ol' Red Beater. IPF 920H headlamps.
I used relays and high output bulbs for the Beater, but for Punkin we didn't want the added expense of adding more wiring and relays, so we used the IPF XX or also called Fatboy bulbs that can be used with existing wiring. Not quite as bright as the Beater's, but far and above better than stock setup. This setup isn't cheap, but you really get what you pay for with lighting.
Super Low Beam XX
Specifications: H4 12V 60/80W
3090K
Features: IPF's Most Powerful Upgrade Utilizing a Standard Wiring Harness
Uses an Exotic High Pressure Gas Mix Contained in a Huge Clear Bulb Envelope for Unrivalled Performance
Stabilizer Rod to Extend Life in Harsh Conditions
Easy Installation -Compatible with Most Modern Factory Wiring Looms and Resin Headlights
Available in Twin Pack
Hella also make a good replacement headlamp that I believe comes with a bulb. Not sure if they require a relay setup or not. The IPF's seem to be a step above the Hella's from what I've read. I'm very pleased with them.