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Responses from face

Zune HD audio cable?
Check out the Zune docks. http://www.zune.net/en-US/products/z/zunedockpack/details.page/ 
Polk LSi7 vs Monitor Audio Bronze BR2
The LSi7 has a nice smooth, warm sound. 
Suggest Speakers for Peachtree Nova
My Tannoy HPD-385A's sound wonderful hooked up to the Nova. 
Can tube rolling change bass?
Yes, it can. 
budget digital interconnect
SignalCable. 
New DAC recommendation $1K, hopefully tube.
Peachtree Nova, although I believe the tube is in the preamp section. 
CD Player for Cary system, pls...
Check out Cambridge's line of players, they're a great bargain. 
DIY Passive Pre & Burson Buffer 160
I agree with your impressions of the stock unit, I demoed one only a few days ago. 
Cambridge 840C as a DAC
Yes, check out http://www.newegg.com, they have a decent selection of USB sound cards. I've have good results with Creative and ASUS products. 
Cambridge 840C as a DAC
You need a new sound card, either internal or external with a digital output. 
Keep Sunfire Amp but change Processor
Or you could go with a bare bones unit like the Onkyo 707, it decodes all the new audio formats and has preamp outs for your Sunfire amp. 
sony xa5400es or marantz sa15s2?
A big plus to the SA-15S2 is that it has a digital input, so it can also be used as an external DAC for a music server, etc... 
Isolating Crossovers
Some of the best speakers in the world do not isolate the crossovers.And some do, such as Wilson. Also, some of the top of the line crossover part manufacturers such as Duelund and Claritycap "pot" their capacitors, inductors, and resistors for be... 
Speaker match with Cambridge Azur 550 integrated
Why not consider Cambridge's line of speakers? They sound excellent for the money. 
Dynaudio C1 with more impact
A small two way hooked up to a tube amp is not going to give you what you need.