Just replaced the last of my compact florescent GU10 bulbs for Osram GU10 7 Watt LED GU10 Bulbs, so much better instant light and only 7 watts.
LED bulbs are so much better than halogen and compact florescent. They light up immediately, rather than slowly light up from a dull glow. They also last up to 15,000 hours whereas a standard halogen bulb has a lifespan of around 1,500 - 2,000 hours.