At first I thought you said HK 3300, but 7300? Dude, it's like comparing a 911 GT2 to a 350zx. Both the Pioneer and HK are nice, but we know which outclasses the other. The 7300 is one of the most expensive amps you can buy and the damn thing still has a plastic front end
. Very lame of HK. If you're willing to spend that much $$$ then look at the Denon 3806.
If you're sucker for the blue light on the volume wheel, you can always get a Onkyo SR 703. Fantastic amp! It has pretty much all the options and more than what HK offers in the price range. And it's less than $700.
I have the HK 135, and I didn't even notice the front was all plastic until I set it up. The Black LCD part, yes, but not the silver front pannel.