Thomas Coopers Heritage Sparkling Ale Kit - 40 pt.
Cooper's beer kits are a good balance between cost and quality. They require an extra kilo source of sugar. The best ingredient for this is Spraymalt, but you can use sugar. There is also the option of using 'Beer Enhancer' to meet quality and cost at a reasonable place. Of course though, with beer, all the sugars should be coming from the malt - adding simple sugar will increase alcohol but waters down body and flavour.