I am using "priced by attributes" only and wholesale pricing with Dual Pricing module and it's working great for me. The wholesaler sees only the wholesale prices for all attributes. Our's is a little less complicated than yours (with only 2 attribs) but I can't imagine that it would be much different on a larger scale.
However, I am just getting ready to try using a qty discount so I can't vouch for how things will go with that, but I'll post my experience once it's done.
The real catcher is that I'm still using 1.2.6d (upgrade to 1.3.5 going slowly).
This thread helped me alot:
http://www.zen-cart.com/forum/showthread.php?t=35450
Hope this helps,
Heather
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