Hi Tanya, and take this post with a grain of salt
From what i know, memory is not an issue with Windows 7 64 bit OS.
Are you planning to use these PC's with a 32 bit OS?
Now that you have explained things more i understand where you're coming from.
What you can do is send an email to the MB manufacturers and ask if they will produce something with your requirements.
Yup, you already know about the vague "specs"...so will they answer??...
I have seen this "vague" problem with other manufacturers and software vendors.
You could also post questions on hardware review sites that might know and answer for sure...
I expect they won't answer before the official release.
It sounds like you are an enthusiast, so you have different needs than the "Mass Market".
I'm more of an HTPC user, so I have the same problem, but from a different point of view.
If they build things based on your needs, it might cost me more.
I won't like that, should i complain?...
We are both in some specialty/niche market and have to pay for that choice.
Every motherboard i have ever used has features and ports that i don't want or need.
Yet, i have had to pay for these...
Or, did the MB cost less to produce because of Mass Production efficiencies, and it really saved me money?
Maybe this issue goes back to where the assembly line and mass production started?
I have heard "You can have any color you want as long as it's black"...
I think manufacturers have to build based on the "Mass Market" to decrease costs.
With that, i understand the specialty "One Off" builds (if possible) will cost more.
Food for thought,