I did 2 and 4 plus added Cibie spots that work on full beam - have used this set up for years.
I think it depends on what you are after. If it is looks, I would go for the classic appearance of the Lucas 576. If general improved performance is your main concern, I would upgrade the existing headlamps. You could do the following:
1. Fit LED bulbs instead of halogen. Easy, but not cheap and not MOT approved. I would not recommend it for that reason.
2. Change the existing headlamp units (most probably Wipac) to Cibie 180. You will not get better light, but the light you have will be projected better.
3. Fit complete LED headlight units, as RichardV6 suggests. Easy, but expensive.
4. Fit relays to the existing system, so the bulb filaments actually recieve 12-13 volts, as opposed to the voltage loss in the existing flimsy cable system. I just did, with a coneiderably better light output. Quite some work, but cheap and well worth it.
5 Combine 2 and 4, which will be my next step.
I know I am deviating from TS' question, but my view is that if one wants better light performance over all, it is better to improve the existing basic system than fit add-ons. When it boils down to cosmetict, it is another matter.
