Silverstars all the way, wouldn't be without them. Blue/HID effect lights may look pretty but they don't offer anywhere near the same level of light, I will happily accept safety over looks any day of the week (although the Silverstars aren't exactly shabby in this department). Order from Powerbulbs and you get some nice sidelights free too iirc.
Similar situation with indicators, Silvervisions are the bulb of choice for most but they really aren't up to scratch imo, not nearly enough light emitted (been known to fail MOT too), I use Osram Diadems and as well as looking great they are indistinguishable from regular indicators.