I have a very ancient system (Q6600@3600) and I am itching for the longest to upgrade.
So I am looking into a 4690k on an Asrock Z97 Extreme6 which I can hopefully overclock to 4.5 or so.
Now I read Skylake is already around the corner, although possibly delayed. Obviously I feel odd now upgrading if an entire new architecture might come out late next year? (Here I simply want to ignore Broadwell, not that I see any sense in Broadwell anyway...)
On the other hand, something new is ALWAYS around the corner...so what should I do? Get a recent Haswell system and then (maybe) upgrade again once Skylake has come out?
I am going to have to go against the recommendation to upgrade to a Haswell 4690K for 2 reasons:
1) You waited this long to upgrade but you missed the perfect timing to get i5 4670K/4770K 1.5 years ago. In other words, you waited nearly 2 years to get 97% same tech as 4690K/4790K, but Skylake is probably just 7-8 months away. If you are going to get new DDR3 and pay $240+ for an i5, might as well wait for the latest tech that's around the corner and get DDR4 that will be viable for 5+ years, while DDR3 is basically worthless after 2H 2015. Based on Intel's CPU trends, usually more often than not the best time to buy a desktop Intel CPU is at the beginning of the next Tock cycle (Jan 2011 SB, June 2013 HW, and soon Skylake). Ticks rarely bring anything worthwhile with minimal IPC increase, minimal extra overclocking headroom, but nearly 1 year later. In the case of 4690K/4790K, it's even worse since they aren't even Broadwell-K refreshes, so you don't even extra features, a lower node or reduced power usage.
2) Given your upgrade pattern (or lack thereof) of holding on to a 2007 Q6600 (a nearly
8-year-old CPU!), if you are going to upgrade, might as well spend the extra $ for the 5820K or 4790K. The extra $ over the next 5-8 years you'll likely hold this system will not mean much to you in terms of total ownership cost over such a long period of time but the extra performance from 50% more cores/HT will surely come in handy over the next 5-8 years. Considering 4790K works at 4.4Ghz out of the box, buying an i5 4690K and overclocking it to 4.5-4.6Ghz with an after-market cooler is worth than getting a stock 4790K and running stock cooler. If you have a MC near you, then 5820K with Asrock Extreme 4 board is a better option than 4790K over such a long period of holding the system. If X58 Xeon drop-ins are any indication, X99 chipset could benefit from some incredible Xeon bargains at the end of its useful life too.