Upgrade?
Hud,
You aren't going to want to hear this, but that was not much of an upgrade. That is Pioneer's entry level receiver. Although RCA is not known for it's audio gear, it may have rated it's receiver conservatively at 50 watts.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14981&item=5775051478&rd=1&ssPageName=WDVW
Check out how Pioneer rates their entry level receiver:
Surround Power 660 Watts Total System Power - 110 watts x 6 (1 kHz 1.0% THD @ 8 Ohms)
Whenever purchasing a receiver, buy ones that have a rating at 8 ohms at 20Hz to 20,000Hz, at .05% distortion or lower. When you see ratings at 6 ohms, 1% distortion, and 1kHz, they are trying to hide something to inflate the power ratings. Unless you jump up to a Pioneer 1014 or 1015 model, I don't think you'll be satisfied.
For instance, Harman Kardon's AVR235 is rated at 55x7, but it will put out twice the power as Pioneer's 515 because of a better transformer yielding higher current. It's not until you step up to the higher end receivers that you'll see a large gain in power. Check out the price tag on the HK.
Finally, your Fluance speakers are very inefficient. The spl rating of 87 and 88 is worse than my Polk speakers, which are known to drain the life out of amps. If your speakers were rated at 90 and 91db, you would get twice the volume out of your receiver.
One blue collar method of telling how good a receiver is - check the weight. The ones below are 30+ lbs. I think you need to save up for one of these if you like your speakers:
http://www.bestbuy.com/site/olspage.jsp?skuId=7034112&type=product&productCategoryId=cat03031&id=1099395572329
http://www.ubid.com/actn/opn/getpage.asp?AuctionId=10373206&refLoc=searchall