I'm a complete audio noob

About a year ago I bought a Samsung 40" LCD 1080i screen that came with 5.1 speakers and a HT-TQ72 receiver (1000w)

Last week I bought a Sony BDP-S550 Blue-Ray player and a new receiver, Yamaha HTR-6230 (500w)

I was planning on putting my Samsung Receiver upstairs to listen to music (no TV) and put the Yamaha Receiver downstairs (w/ the Samsung 5.1 speakers) with the LCD and the BR player.

Would that make any sense ?
Is the Samsung receiver HTIB better than the Yamaha I just bought ?
How would the audio sound if I plug the 1000w 5.1 speakers into the 500w receiver ?
Should I get a refund for the Yamaha and put extra money for more watts ?

Please help !