What number is significantly more than 4?
We talking RAM or GHz?
If you wanna somewhat futureproof your rig, go for at least 8GB of RAM, it's dirt cheap anyway.
Don't buy AMD processors. Go for the 4th gen i7 or i5 processors from intel.
>Going for the shitty ix intel processors.
Get Xeons or Phis, anything else is garbage.