a very very excellent sub to consider is TBI .. they have very "fast" subs with lightening fast transient response .. they have been able to successfully match with electrostats ..
about 1300 gets you a cool/strange looking sub ..
http://www.thoroughbassinc.com/magvipsu.htm
something to think about .. only thing is they only get down to 25hz or so .. so they do midbass and some lower bass .. not supposed to be the loudest, but considered to be the best by people who have heard them [i havent yet my audiofile buddy has tho]
you are a step before me i am looking into getting my system 2gather, hopefully this summer?!
be good and enjoy the music ..

