I need to replace my rear tyres next month, their currently Pirelli's and will cost a smal fortune to replace; are there any cheaper alternatives that won't result in increased road noise, reduced safety etc? I want to spend about £200 in total
The title and your description say quite alot about peoples opinions of a "good tyre", increasingly this seems to equate to a cheap tyre.
There in lies the problem. Cheap tyres equals shite tyres. Good tyres equals expensive tyres. There is no such thing as a good tyre when you take price into account sadly. If you want a tyre that works you will be very disappointed for that money IME.
Take into account your driving style, budget and what you find acceptable ,or not, in a tyre it becomes very difficult to recommend a "good tyre".....but i guarantee you one thing, at that price range, the very first thing to suffer is stopping distance,(followed by road noise) making the whole game a gamble and quite possibly a very expensive gamble at that.
Good luck. For that money, you'll need it i'm afraid.