Shame im going to UK this weekend, if you know exactly what you want i could look? Or if you do next day delivery to my house i could bring it back, although i suppose there's alot of trust required there!!!
Best is to go to a Squash centre which has a shop attached and test a few. You won't (necessarily) get the best price but you should find out exactly which suits you. Weight, balance, power, control and vibration vary a lot from racket to racket and having one in your hand is the only way to find out.