I just recently got my first airbrush at xmas after years of model making and yearnig for one. I decided to go for the top of the range aztec model - A470 coz i want it to last and not end up feeling i need to replace with a better model when my airbrush skills are fully developed. I suggest u take a look at the aztec range coz i think they are the best available at the moment. The seperate nozzles make them easy to maintain and they are simple to use, im getting to grips with mine after a short time and im very pleased with my choice. I live in the UK too and mine was £89.99 which i thought was quite a good price considering the airbrush body has a lifetime guarantee. i also got a compressor from machine mart for £70
http://www.machinemart.co.uk/product...0&r=2007&g=102 - cheapest ive found in uk! And its exactly the same as the compressor available from aztec but without the air tank.
http://4toycars.com/index.cfm/fa/pro.../ProdID/89.htm
Im also picking up an air regulator with water trap £34 this week - u may also want to account for that in your budget if you plan to do alot of airbrush work.