Well, your Onkyo is clearly the weak link - both as a pre-amp and as an amp. I'd be inclined to drop the Onkyo and look for a decent pre/pro + power amp. Maybe a gently used Anthem, Classe, Cary or similar.
Just adding a power amp to the Onkyo will help drive the Totems properly, but won't likely improve the overall sound quality a great deal.
As far as getting a good stand alone DVD/CD player, I don't think such a thing exists - that will play Blueray. If you are really into good CD sound, look for a decent CD only player and either keep what you've got for blueray, or get a cheap blue ray player as well.
For 5 vs. 7 channel, except for the odd blue ray disc I doubt having more than 5 channels is worth it. Personally 5 channels is plenty for me. Of course, if you are set on it, go for the 7 channel - it's likely a lot cheaper than adding another 2 channel amp later + power cord etc.
Just my pov
Just adding a power amp to the Onkyo will help drive the Totems properly, but won't likely improve the overall sound quality a great deal.
As far as getting a good stand alone DVD/CD player, I don't think such a thing exists - that will play Blueray. If you are really into good CD sound, look for a decent CD only player and either keep what you've got for blueray, or get a cheap blue ray player as well.
For 5 vs. 7 channel, except for the odd blue ray disc I doubt having more than 5 channels is worth it. Personally 5 channels is plenty for me. Of course, if you are set on it, go for the 7 channel - it's likely a lot cheaper than adding another 2 channel amp later + power cord etc.
Just my pov