If you want better lighting for night-time driving, upgrading your fogs isn't going to help. Don't get me wrong, I have gone through like 5 different pairs of fog light bulbs and some are clearly better than stock. But the problem is, fog lights are designed to illuminate only what's immediately in front of you, so based on that, upgrading to better fog light bulbs isn't really going to help you much.
Your best bet is to go with a pair of bulbs that are stock wattage and bulbs that you can't buy in the US. The US has more strict regulations when it comes to bulb brightness. Check out www.powerbulbs.com, they are based in the UK, they sell great bulbs, and shipping is included with the price (takes about a week to get there). Philips Vision Plus bulbs are the best if you just want better fog light bulbs and prefer the stock yellow-ish Halogen color. Philips Blue Vision bulbs are the best if you want better fog light bulbs (although not as great as the Vision Plus bulbs) and HID color.
Personally, I am currently running a pair of Philips Rally bulbs...they are not street legal anywhere in the world (they are for off-road use only) because they are so bright. They light up the road immediately in front of me REALLY well. But they are higher than stock wattage (90W/100W) and therefore I can feel (by touching the glass over the headlights) that they burn much hotter than regular wattage and fog and fog lights just don't illuminate as far down the road as Xenons do. So considering these two factors, I am waiting for my Philips Blue Vision bulbs to arrive in which case I will install them immediately and that will be my final lighting setup, heh.

MrElussive
03 G35C 6MT