My current flatmate rejected an oxbridge uni after getting A*A*A*A*A (can't remember which uni at this second) to come to Reading, admittedly his course isn't widely offered but still. Reading is certainly good. The campus draws a lot of people too. I wouldn't be surprised if within 5 years we're ranked in the top 20, which given how good some uni's are in the UK, is really good.
At the end of the day, if you feel like you'd do better in St Andrews or Warwick or something, and you prefer the universities "feel", location, atmosphere and campus, then go there. But frankly, for this sort of intermediate-high level uni, I think we're the best. Once you get outside the top 13 (going off Guardians league tables), there's no uni that I would of gone to over Reading given the choice, regardless of grades.
Another thing - A first from Reading is far better than a 2:2 from Southampton or whatever, so don't go somewhere much higher if you think it'll drastically impact your results.
Oh also, A level grades don't mean you'll find it easier. A Level is very different from Uni work. If you had people pushing you through your A levels or went to private school or whatever, you cannot sit back and think you'll be fine just because you've shown your capable of getting good grades (bar 1st year, for most). University is all about showing to employers that you can learn how to learn efficiently and independently. If you need people to tell you when to revise, you won't do as well as you think.