Gotta agree with saxton - you're better off raising a standard amount with your big pairs and saving the unusual aggression for post-flop play (assuming you still think you're ahead). Raising big before the flop can sometimes have good results against absolute fish, but if you run into a decent player you're begging to get broke... not only that, there's a good chance you'll be pot-committed because of the large pot and the amount you've already put into it, and if your opponent flops something good you'll invariably pay him off. I'd rather raise smaller and treat those hands for what they are: good starting hands that I can comfortably fold if an opponent goes raise-crazy.