I have had a few different sets in mine over the years, started with the CCFL's which didn't seem to last, the colour changing ones which were OK for a while but the white setting was more blue than white. The most recent ones I have are SMD LED ones, which are very bright an should last a lot longer than CCFL ones. They look like this
I am very impressed with mine, originally my brother had them on his E36 as that is what they are designed for so do need some small modifying but as I did it before on the colour changing ones I knew what to do (Lee knows how to do it).
You can get them for around £20, from
here but they come from Hong Kong. If you want them from the UK then you will pay and extra tenner upwards.