you should get an inexpensive sep' amp for your set up.
you can get a nice clean and powerful amp for around $300. on ebay. --(like an adcom gfa555) just to name one, -(that i always name)...
i think it's a small investment to make considering the amount already put forth. it's all about how nice you want your investment to sound, and a lot of people DO want their speakers to sound as goos as possible. --- your just not going to get that sound with a regular ol' reciever/amp...............
sorry to post that thought again to those whom have read before, but to me, we all spend this "chunk" on our audio/video equipment, then let it boil down to the "stock" reciever, when we really want it to sound as GOOD as it can.
heck, i whish i lived in your area, i'd bring mine over just so you could hear the difference. --- and please don't take this negatively, it just makes a really nice difference in sound quality, and wanted to share the moment.