If you have plastic headlamp lenses, I would start by polishing those until they're crystal clear. HIR bulbs might be your next logical step and are low hanging fruit versus your next best bet, which is a custom headlamp wiring harness with larger gauge wires, etc.
If you want to spend real money an HID or LED retrofit is the true answer. I'm currently swapping Lexus RX350 bi-xenon projectors into my JDM STI headlamps.
The one thing you should avoid at ALL COSTS is the inexpensive LED/HID upgrades that put a halogen bulb base on an HID/LED bulb. Not only are these illegal in all 50 states, but no matter what a company's marketing says about their product, you can't cheat physics. Halogen lamps are designed to work with halogen bulbs. HID lamps with HID bulbs, and LED lamps are designed around the way an LED outputs light. YOU CANNOT REALISTICALLY MIX AND MATCH BULBS AND LAMPS and expect to actually have "better" night vision.