Sholling, you are absolutely right.
But, I do believe the Onkyo TX-SR606 is sold out now (was only $320). Yes it is (sold out).
Unless there is another place that sells it close to that price.
Anyway the TX-SR607 can be had for only $350 right now at 6th ave, with their Price Alert deal.
*
http://www.6ave.com/shop/product.aspx?sku=ONKTXSR607
* Price Alert:
http://www.6ave.com/shop/PriceAlert.aspx?id=ONKTXSR607
But, the Marantz SR6001, which is a great receiver in it's own right, is selling for only $350, which is a huge discount of 71% off! An amazing deal! At accesories 4 less.
*
http://www.accessories4less.com/make-a-store/item/MARSR6001/Marantz/SR6001-receiver-100w-x-7ch-HDMI-home-theater-surround/1.html
If you want the latest with 6 HDMI inputs! and all the audio decoders included, plus separate x-overs for each set of speakers, plus Dolby Pro Logic IIz, plus great power in even all 7 channels driven continuously; the Onkyo TX-SR607 fits the bill perfectly.
But if you also want great sound, pre-outs for all channels, and you could do with only 2 HDMI inputs, and you can accept a choice of a single x-over point for all your speakers, solid build receiver with the Marantz name, ability to take full benefit of the new high resolution audio through Multichannel PCM from the digital HDMI version 1.2, like the Marantz sweet, warm and articulate sound with robust power and great dynamic reserves; then the Marantz SR6001 could be just your ticket.
In the end, these two receivers are great, it's a question of priority of features and sound preference. Value wise, they are equivalent and their price are exactly the same.
"Different strokes for different folks".