Reading lamp questions

Yesterday I bought myself a nice little reading lamp from Ikea. Yes, I know what some of us think about Ikea but this was just what I wanted/needed and it was dammed cheap. 13€

Now I am faced with the question of what lamps to put inside it. I am used to halogen lights and in truth I prefer these to normal bulbs but the lamp is fitted out with normal screw in lamp fittings and I don't want to go to the trouble of replacing the whole electrical wiring system and so I am stuck with the choice of which form of lamp to buy.