I spent quite some time (including a look at posts on here) looking for some GU10 LED light bulbs with a medium light output. Firstly, I need to get a life. Secondly though, I ended up getting the above set of 10 because at £1.80 a bulb, they are not quite as cheap as the absolute bargain basement stuff on eBay (around 1.50ish) but less than those bulbs people rave about from Home Bargains (2.49 each with shorter warranty I think). The perk that made me buy these was the 5 year warranty. That's incredible for the price. Five guaranteed years of LED light for under 2 quid a bulb.
If you want a slightly lower wattage (3w), not that it makes a huge difference, these have a 3 year warranty so still a good deal: http://www.amazon.co.uk/Allcam-Bright-Energy-Perfect-Downlights/dp/B00R1J22SQ