Sushi, let me throw out a couple ways you can get a "free preview" of some of the surround back effects. First, on your 45TX use the Virtual Back Surround mode on CDs with Neo:6 or even one of the DSP modes to create the virtual back. Second, you could disconnect your VP150 and temporarily use a "phantom" center while connecting the VP150 to the left back surround terminal on the 45TX. If you decide to go with back surround, you really should go with 2 (although there's no 7.1 format as such)to stay away from that psychoacoustic reversal effect with one speaker behind you(although John Ashman might disagree).

As to SACD or DVD-A for classical music, I'm not impressed and I'm not planning to get a player. Classical generally uses ambience in the extra channels rather than putting you in the middle of the orchestra and DPLII already does a fine job with that on stereo CDs. Any supposed benefits strictly from more bits and higher sampling rates are dubious.

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Enjoy the music, not the equipment.