[1.2gees]

On your car, I would think the oil level light as well as pressure, and maybe the SRS lights should come on? The bulbs are cheap, I would replace all (and did). This is kind of like replacing the water pump when doing a timing belt, except on a much smaller scale.

The factory bulbs are 2 watts. I recoated the light tunnels (clarks garage mentions this I believe), and replaced the two outer bulbs with 3 watt bulbs. This is plenty of light for me, as I don't like anything bright inside the car at night. Some people have tried up to 5 watt bulbs. Don't do this, it'll melt the sockets. The highest I would go is around 3.5 watts. 3 should be no problem if you're paranoid.
Ahmet