If you like being aggresive, smashing and play singles I'd say have a look for a head heavy racket, it'll give you a bit more oomph. If you play at an intermediate level I'd also say look for a medium flex racket as it will allow you to hit harder a bit more easily for the time being.

Remember choosing a racket is an entirely personal choice, it's whatever feels good for you, so trying as many different rackets as you can will help. Don't get too hung up on what people tell you you should like and what a good racket is.

Final point, don't think you need to spend hundreds to get a good racket, anything £50 upwards will be a good racket and you don't even need to spend that if you don't want to. I personally won't spend more than ~£70 incase I break it!