I ended up buying a hotplate purely because they were the easiest to get hold of. The Weber ones are supposed to be pretty good, but that doesn't surprise me as Ted Weber knows his stuff. The Dr Z ones are supposed to be good, although they are made by another company for them.
As far as headphones are concerned, I'd say unless you get a proper headphone amplifier don't buy expensive headphones. I've got some Sennheiser HD600s and they sound shite through a standard headphone socket. It makes me laugh that some people buy really expensive headphones for their iPods because good headphones need more output than the iPod can provide - although the ZVex ImpAmp looks fun.