If you build your own you can buy bulbs with better brightness/quality.
But why not upgrade to LED for most of the external bulbs?
They last a lot longer and consume far less energy. You can then keep the OEM bulbs as reserves.
Here's a link to assist you:
<a href="http://www.2008ownersclub.co.uk/forum/bulb-change-to-led_topic305.html#.U8q6v_ldV5Y" rel="nofollow">Bulb
change to LED</a>
Al.
Edited by: allan40alt