i own a quake, nice little sub, its more suited to providing a good quality bass rather than quantity tho, turn it up too loud and it does tend to lose control.......i'd say use in a room no bigger than 12x18 for best effect....
it does however still go very low considering its size....lower than most subs do at the price range.......
i dont know how it compares to the other ones u mentioned, but i give it a thumbs up.....can be had for around £300 now i think from Sevenoaks brand new, however you could probably get it second hand for under £200 quite easily....