More expensive receiver vs. cheaper one with amp

I recently sold my pro-logic setup so I could utilize digital connections for my components. I do have a Denon 2801 receiver that I have been using with my klipsch speakers. I don't really find this receiver to be that musical, better than my old db940 sony but much less than that of the Onkyo SV-90 that I just sold. I can purschase one of the following-AMC R9 for $360 (100x5), Marantz SR5000 $288 (70x5), NAD 751 $459 (60x5), or an Outlaw 1050 ($499 I missed out on the used one posted today). My budget is really about $360 but I could stretch it to $500 if I had too. My dilema is this-do I spend the money on the NAD or the Outlaw or buy the Marantz or AMC and then buy a used 2 channel amp such as the Adcom 545 II or the Nad 216 thx? The price spent would be about the same in the end. I listen to a lot of music on this system via a Denon 560 changer watch TV and movies via DVD and digital cable. I listen to music more than movies. I currently have b&w bookshelfs and will expand the rest of my speakers in this brand. Thanks in advance for you comments.