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30 inch displays with a camera / mic in them....

I think not. Apple is smart enough to keep their monitors from having sound, as generally monitor sound sucks. Mic maybe nice, but at the same time, does MiniDisplayPort really need some more junk attached to it?

i7 octo with @ 3.2GHz/3.4GHz, 12-16MB L3 cache.. gtx 295 2GB?

You can have your 295 and eat it too with an injector, methinks.

I always wondered, what's the "Bus speed" for??? (I assume it's the fsb) but what does it actually do? and also what's the L3 cache do better than an L2 cache?

Bus speed is the number of cycles that a data path can trasmit data; a 100 Byte/cycle lane operating at 400 cycles/second will transmit 40,000 Bytes/second.

If a processor has an L3 cache, it has an L2 cache. Basically memory on the CPU, enabling it to fetch common/recent values much faster then accessing memory.

I've also been wondering why apple don't have 1600MHz ram :O

Probably made their (outdated) EFI unstable.
 
I've also been wondering why apple don't have 1600MHz ram :O

Kind Regards

Because it's not supported on Xeons and there is no 1600MHz ECC memory for them to offer. 1333MHz isn't even supported on 3 out of the 5 processors they offer and isn't on the other two if you fill all 8 memory slots.
 
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