I own an Intel Core i7 5820K 6 core cpu, and now coffee lake has been released I am feeling the upgrade itch and the i7 8700K seemed really tempting
However I have gotten an offer for an Intel Core i7 5960X 8 core cpu for £300, which I find real tempting since I don't need to change platform (reinstall windows + programs). Would it be worthwhile the upgrade? Have any of you done the same upgrade path?
I can probably get £150~180 for my current cpu, making it an £120~150 upgrade.

However I have gotten an offer for an Intel Core i7 5960X 8 core cpu for £300, which I find real tempting since I don't need to change platform (reinstall windows + programs). Would it be worthwhile the upgrade? Have any of you done the same upgrade path?
I can probably get £150~180 for my current cpu, making it an £120~150 upgrade.