Hi.
I was doing some tests, and was curious if my conclusion here is correct...That poly counts affect render time more than texture sizes by a fair margin, but texture sizes affect memory usage far more than poly counts.
Polys vs. texture size
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Thanks, Chris. It never dawned on me that the poly counts were SO much more labor intensive than the textures...I wanted a render to concentrate on some particular parts so I dumped all the textures on all the others. For a reduction of textures of maybe 70%, I only saw a render speed improvement of about 11%. Live and learn! 

Win7 | Geforce TitanX w/ 12Gb | Geforce GTX-560 w/ 2Gb | 6-Core 3.5GHz | 32Gb | Cinema4D w RipTide Importer and OctaneExporter Plugs.