For me if I have a chanel bag then I will have a LV wallet, prada makeup holder, clic bracelet, McQueen scarf etc. I wouldn't want to wear too much of one brand, kind of an over kill in my opinion. :-/ mixing it up is much more fun!
My thought is: whatever and how much you feel comfortable with! (Sometimes I "drench" myself with H, but mix it up between recognizeable and under-the-radar.)