Tom, Sony ES series is great buy. Sony STR-DA3ES is very powerful... I just bought one. I can get you a great deal from someone I know. Retail price at electronic store is about $1000 but I can get it to you for about $780... let me know if you are interested to buy this great unit.
I would say a Denon 2802 is safely in your budger along with an Onkyo 696. If you can find a good deal over the net, or are willing to splurge, then an Onkyo 797 or Denon 3802. A Yamaha will also be a decent buy, but really, I would stick with either a Denon or Onkyo. I own a 797 and I really like it.
"What's the best receiver for my $750?"
Hmmmm.... I'll say for that amount of money Integra DTR-6.2
Here's a good review - Link Removed
Most company's have a higher end line. Sony has "ES" Onkyo has Integra (with the exception that Onkyo and Integra are completely seperate company's)
Click on receiver's in the table of contents/master index.
Can't beat the sound of the dual high current power supply design. The D/A convertors sound awesome too. They really put the sound quality first and foremost.
If I'm not mistaken Tom, you are/were the owner of an HK AVR80II. If so, and you love the HK sound, I second the recommendation for the HK AVR520. Among other things it does DPLII and Logic7, DTS-ES, MP3 decoding, preouts and main-ins on all channels, 7.1 inputs, and HK's well known over-achieving amplifier section. It's close to the perfect receiver - and in your price range.