When we want a treat we go to Zenxi. Yes it is more expensive but you are paying for a much better experience than the usual average to nasty meal in a typical high street Chinese restaurant. By experience I mean the service which is attentive and very professional, a unique and quality decor not seen in any other Chinese (or other types) of restaurants and a good choice of really tasty food.
We've been a few times now, on our own and with friends, and each time we have come away delighted. Some of the staff recognize us and ensure they come and say hello.
If you have not tried this restaurant then give yourself a treat and go.