Cheepest way to upgrade yer headlights is to Slow Down!
But if ya do want to spend some cash uprating the wiring is going to be much more sussessful than just splashing out on some new bulbs. Check out
this thread for a how to, for adding relays to supply more current to yer existing bulbs, you might even find the bulb upgrade is unnessasary after all.
I'm really light sensitive. It really really p*sses me off when folk have badly aligned and ridiculously bright headlights, not to mention the twonks in X5s new mercs - well pretty much every new car actually. If you cant see well enough to drive at night with "normal" headlights then you shouldn't be driving at night*
*Ahhh calm now - appologies for the tirade.