I use the 5 LED type as-well. Got a set on ebay, one broke after 4 months but they replaced it free of charge.
I have just got a set from autobulbs (same type) as I hoping they will last a bit longer.
I think they look pretty good. Definitely more modern looking. I did my numberplate, interior and boot light at the same time.
EDIT FOR REF - The front sidelights x2, rear Numberplate x2 and boot light x 1 are all the same type - w5w 501.
The interior light requires 2 x 30mm festoon type bulbs.
White LED is the way to go for the modern look, they are white with a tiny hint of blue. You can get them all cheap on ebay but they may not last too long. Not so bad with the easy to change bulbs but a pain with the sidelight bulbs.
I would recommend Autobulbs direct for good quality items and if you PM a mod they will give you a discount code.
Here you go;
Sidelight - 2x http://www.autobulbsdirect.co.uk/501-led-extreme-power-1.5w-360-degree-white-blue-red-amber.html
Numberplate and boot - 3x http://www.autobulbsdirect.co.uk/501-LED-Single-Assorted-colours.html
Interior - 2x http://www.autobulbsdirect.co.uk/269-4-led-festoon-bulbs-30mm.html
Sorry about the crap phone pics.