While it might not be in the same league as the Theta or EAD ( don't know, never tried them ), you might also want to consider the Sunfire Cinema Grand Signature. Given that it is rated at 405 wpc @ 8 and 810 wpc @ 4, it will drive ANY load that you throw at it and never runs out of steam. The fact that it offers slightly different "tonalities" for the mains and center via the voltage or current taps gives the amp even greater versatility. Another EXCELLENT feature is that the warranty ( five years parts and labor ) is fully transferable even without a receipt. If you want to know how long is left on the warranty, look at the serial number. The first two numbers are the year that it was made.
To top it off, you can typically find these in excellent shape for WAY under $2500 on the used market. Mine was "mint" and set me back $2000. I use it for the center, surrounds and my two subs with a two channel Sunfire Signature ( 600 wpc @ 8 and 1200 wpc @ 4 ) feeding the mains. The 2 channel amp for the mains set me back $1600. As you can see, i'm a REAL bargain hunter : ) Sean
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PS... Some HT amps are voiced notably forward in order to aid in clarity of dialogue on movies. Make sure that you listen to them carefully to see if they will work in your specific installation. While that might be okay for movies, it can be somewhat annoying for music.