Amps won't help much. those Klipsch speakers are both very sensitive and won't keep their composure at super high levels anyways.
+1 . And besides you don't need more power to drive the tweeters. Tweeters need 10-15 watts RMS at max to keep them balanced with more power hungry mid bass drivers.
CD Player is useless. They all sound the same, unless your mind can slow down Time
+1 . because it isn't the CD player that renders the image, but the video processor.
If you don't game, there's no reason for a PS3 anymore, since even the $100 Panasonics are as fast and as the PS3 for movies now and PQ is not much different on any BD players I've seen
+1 . Or better yet build yourself a computer with a BD player. BD player is merely a transport.
Speakers often give the most bang for the buck when it comes to SQ.
Not often, always.
but there's a big difference in audio quality and capability using the Oppo if that matters to you.
The reason for that is because OPPO has a better DAC. And there are better DACs out there than what OPPO has for lesser price. Oppo is better because Oppo selects good third party components. There is nothing Oppo about it though.
Stick to what YOU like. You like klipsch over infinity, then get all klipsch. I am not loyal to any brand as it is very clear from my talk above except for the one that gives YOU the better bang for the buck.
Now a days, I think BD players including Oppos are stupendous and waste of your hard earned money because for that price you can get a computer with a good sound chip. Will eat oppo for breatfast.

(oh here comes the oppo fan boys

). I have used a few chips from Realtek - AC888 and some VIA chips. I find VIA (especially the VT series) to be excellent when it comes to SQ and DAC performance. Never tried C-Media chips but higher end sound cards tend to use them.
http://www.via.com.tw/en/products/audio/codecs/vt1708b/index.jsp
That chip in particular has 98 s/n ratio, 24 bit audio processing and 192 kHz audio processing. And no I don't work for VIA. You may want to consider using computer as your source. You would be surprised the amount of flexbility you get if you dont mind investing maybe one to two hours to configure ubuntu/windows media centre on it.