The value upgrade algorithm

0.Find the cheapest(non-secondhand) computer.
1.Compare its specs against your own computer.
2.Are the majority of characteristics x2 better(ram size,cpu benchmark score,etc)?
3.IF yes,buy the computer.
4.IF no,wait for next iteration of "cheapest computer" && repeat step 1.
This way you save a lot of money, while laughing at all the bleeding edge "enthusiasts" upgrading every six months for trivial gains.
Same thing can done with components which have clearly defined characteriscs(like HDD/SSD/RAM/CPU/Video Cards/Sounds Cards,etc)

prebuilts a shit

I've only used a laptop for the last few years now. Kinda want to trade it for a lighter model even if the performance isn't any better.

ANUS