hi, would need a suggestion.

i would like to upgrade my pc. currently on core ii duo with ddr2.
but i have budget around 900.
looking get new mobo,proc and ram.
will save for gc next time as i am currently using hd6850.

the question is

do i buy high end used sandy bridge or haswell for performance or just opt for i3 skylake to focus on future upgradability

thanks for the quotation.
searched garage sales for used mobo cpu...saw some good offer for used sandy bridge chipset.

but still unsure on which choice is the better. old chipset with higher performance proc or latest chipset with low end proc.