I put sylvania halogen silver stars in my 40 and it was a big difference. The relay mod is a good idea and will save you from melted wiring and burnt up head light switches if you put in the brighter style head lights.

There are a lot of options to put a newer style 7" housing in these old buckets. There are also a lot of different options for bulbs. LED, HID, and projector. IMO I wouldn't get any of the drop in cheap stuff because it usually is a PITA to get the stuff setup to not blind other drivers. Buy a nice manufactured setup if you plan to go LED is my recommendation.