Pearl makes something called the Rhythm Traveler, $499.99 --a mini-kit which includes mesh heads as a silent practice option (it comes with regular heads too--can't vouch for how much punch you can get, but I have some tuning and muffling tips which might prevent them from sounding weak).
http://www.musiciansfriend.com/drums...FQvznAod-G0AyA
Or, for $169.99, the DW Go Anywhere Practice Set. I am actually considering one of these, as I have taken a Monday-Thursday "road warrior" contract gig will be staying in an apartment half of the week. Essentially silent (people living directly beneath you might hear you stomping the bass pedal); and you will note, smaller footprint than even a "mini" kit.
http://www.musiciansfriend.com/drums...e-practice-set
For electronic drums, the first kit I would recommend (when sorting by price, low to high) would be the Roland V-Drums TD-4-KP-S Portable Electronic Drum Set, $799. Small-ish footprint; designed to fold up; the best option for silent practice (which will actually sound incredible through headphones); and the most expensive of the three options--of course.
http://www.musiciansfriend.com/drums...ronic-drum-set