Just bought a sick glass bong--glass on glass, ice notches, diffused, with an ashcatcher-- and it hits better than any bong I've ever hit with the possible exception of a friend's RooR Dealer's Cup.

Basically, glass will hit smoother, cleaner, and taste better than plastic, and a glass-on-glass bong (instead of slide and grommet) will hit even better. The biggest thing I can recommend is getting a glass bowl and slide--metal bowls taste like shit, and don't hit as well.

Here's what I picked up: