Just a question: how many times this new computer should be faster then the actual one you are using?
The ‘incremental’ power (in CPU/GPU/HD speed/Memory speed) in the last years is getting lower and lower…
I still have an AMD Phenom II X4 955+4GB RAM+gfx Radeon HD5700, and an ‘old’ HD – and sometimes I get the ‘monkey’ to change everything… then ask myself for what and stop thinking 
ps: just read that AMD has shown its last ZEN CPU (no sure when it is sold, maybe at the start of the next year). I would way just a moment only to see an hoped fall in the price and a little bit more competition on the CPU field (Intel prices are just a little too high for my tastes!).
Cheers