welcome :-)
if you don't mind 2nd hand it would open your options a lot bang for buck wise- just be sure to get lots of pictures,
if you could stretch the budget a bit it would give u many more options for new kits but obviously you would have to build it yourself, buy an esc, motor, radio gear, paint etc which is where it gets a bit more expensive. your wise to avoid rtr stuff it's mostly made from cheese, with a few exceptions. however if you don't mind gradually upgrading bits when they break look at rtr's like Kyosho inferno mp9 ready set as the 'factory team' parts are interchangeable.
look on hobbyking uk for batteries and possibly a charger too, look for one that runs on 12v and 240v for the convenience of charging from your car battery when out and about.