Speakers for new receiver
Wess,
You might considering trying the new Yamaha receiver, calibrating it and assesing the performance of your current speakers. Depending on what receiver you are using now, it may be an improvement.
If you still have an itch to upgrade, check out the budget speaker reviews on this site including the Onix X-LS bookshelf speakers. They should provide a quality and performance improvement to your system for just over $200/pair. I didn't see a sub listed, so you might want to add that to your system first.
Also, the Yamaha HTR-5960 models is comparable to the RX-V659 and you might be able to get a better deal from authorized online dealers.