I found out over the years that I don't upgrade computers. When I want better performance, I usually build myself a complete new machine, and relegate the older machine to less intensive tasks (or I sell it).

Reason: the performance of a machine is the total of CPU, memory, disk, graphics card and mainboard combined. In 3 years time, the current bleeding edge chipsets and mainboards will be slow mainstream. I'm not going to put a fast CPU in a mainboard that can't keep up with it - I buy a matching mainboard along with the CPU.
Same goes for memory, disk and graphics card.
The only thing I tend to keep is system cases - when they're good. One of my machines is sitting in an 8 year old Chieftec that's solid enough to use as a stool.

In my opinion, the upgrade argument is a weak one.

The raw performance argument is far more convincing. If the 920 indeed performs 40% faster on your key applications, it very well may be worth the extra money.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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