A few pieces of advice: Firstly, if you are getting subs, and especially dual subs, forget about getting full range tower speakers. The only advantage tower speakers have over the equivalent bookshelf speakers is bass extension, but since the subwoofers is going to be taking over that bass range, a tower speaker offers zero advantage over bookshelf speakers. Knock the front left and right down to bookshelf speakers, take the price difference and put it in the subwoofers, where it will make a much greater difference for the better.
Second, The subs from Klipsch and Deftech are not very good for the money. Skip them. Get a sub from a dedicated sub maker. Rythmik
. Dollar for dollar, a sub from any one of those companies will knock the pants off of any sub from Deftech or Klipsch.
Third, do not use bipole or dipole speakers as surrounds in a 7 channel system. In a seven channel system, the surround sound stage is meant to be more discreet and localizable. Bipoles and dipoles like in the systems you are considering make a unsalvagable mess out of the surround sound stage and defeat the point of expanding out to 7 channels. Use monopoles instead, ie regular bookshelf type speakers which radiate sound in one direction. They will perform better, sound better, and cost less.
Fourth, instead of a Denon AVR-x3000, get an X4000. It has better room correction calibration, Audyssey XT32, and it can calibrate dual subs independently, which will be a big plus for your setup. It will be significantly better without costing a whole lot more.
If I were to get a Klipsch setup in a five to six grand budget, I would go with: RB81 fronts, RC62 center, RB51 surrounds. For the subs, I would go for a pair Reaction PV15x
or Hsu VTF15h
. Another system which would be brutal is: Ascend CMT340
s for front left/right and center
for surrounds, and dual Rythmik FV15HP
for subs, which would be an absolutely monstrous sound and would blow all your guests away.
To mount the surrounds, use some Videosecu side-clamping mounts
. Get your speaker and HDMI cable from blue-jeans cables
. Those systems would be roughly the same price as the others, but it will dramatically outperform them.