Your stuff looks fairly hdr heavy - maybe the extra'll make all the difference to you...
No, the wireless keyboard doesn't benefit from the USB ports unfortunately. I think the wired mouse has to use one of them anyway, so not having them isn't a great loss.
Wireless Mouse - Wired keyboard perhaps? Or am I going mad?
I can remember back in the Power PC days a 50 or 100mhz jump was more than worth the price but these days the new macs seem to benefit more from RAM and D upgrades than a speed jump.
I've got a 2.4 in my macbook pro and it's blinding.
I'm jealous - the new iMacs are the dogs bits
They charge £80 extra for the 1Tb drive in the 2.93GHz model so you are effectively paying £220 for the extra graphics memory, better graphics processor and CPU.