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I've gotta highly recommend the relay idea. You get more power to the lights as the resistance is much lower and your power point is direct from the battery. You'll need 2, 1 for high beam and 1 for low, but they can be added to the factory wiring in about 30 minutes and will make your lights much brighter.
Sylvania XtraVisions work fine and don't break the bank. A pair for $25 on Amazon. The relays do help brightness too, as you know. When the day comes to install them, you will be glad you did.