Spiffyfast's right. Best Buy no longer carries the VSX-9300TX as I found out when I went to get a replacement for mine that was hit by lightning.
They do however carry the VSX-56TXi which I did end up getting.
Since I've had both, I can now say with 99% assurance that the 9300tx and the 56TXi are the same except for the i.link connectivity and the heavier full aluminum door hiding the buttons on the front(9300 has aluminum skin attached to a plastic frame).
The 9300TX is an extremely robust, very capable a/v receiver. I had no qualms with it whatsoever in fact, I was very disappoint that they were no longer carrying. However, it is still available.
www.vanns.com has it for $799.99 with free shipping and no tax(They
are an authorized Pioneer retailer).
If you don't have a dvd-a/sacd player with firewire output then I think it's just about a no brainer. Being built like the 56txi the 9300TX has a lot of power via a massive power supply and dual 27,000 uF capacitors. The 52Tx and the 54TX both have smaller rated capacitors(I believe on the order of 17k and 22k respectively) and neither of them have the USB input which allows you to use the receiver as the audio output device for your computer. I finally got to try it and it works great!
Also, unless I'm mistaken, only the 56TXi/9300TX has the advanced MCACC with professional calibration EQ. I would have never upgraded to the 56TXi if my 9300TX hadn't been electrocuted. I really liked that receiver. If that hearfelt statement doesn't work...did I mention it weighs 44.8 lbs!
It just feels like quality. Of course I felt bad for the UPS guy carrying it up the stairs to my apartment.