As Luca said above, it may simply be better to get a new CPU/mobo/ram bundle and sell the old one. A core i5 4690s at 65w will be a lot less cooler and up to 30-40% faster, which of course makes no difference in HTPC use but does in gaming. It occurs to me that selling the old kit, actually makes the cost of upgrading comparable to the cost of buying a ton of expensive fans and coolers.
To be fair, as you suggested that a Noctua NH-C14 was excessive for your task, I said that a low end
contemporary Intel platform could have offer cooler temps and less power draw, for a tad higher but still comparable amount of money to that specific heatsink, while still providing "enough" computing power (where "enough" actually means a tad higher computing power than your current setup).
Now a Core i5 cannot be said a low end platform (and the relevant cost is far higher than the Noctua NH-C14 one), as an Haswell-based Pentium or Celeron is more properly low end (talking about italian prices, about 80-90 euros for just the cooler vs 120-150 euros for a Celeron-Pentium/B85-H97/4Gb DDR3 combo, while maybe a 54w Core i3 might still be considered, if you mind).
Another aspect to take into account is your gaming requirements: while a Core i3/Core i5 surely offer a more performing GPU than any Pentium/Celeron (but those latter are more performing than any Core 2 Quad IGP, however), so having a clear advantage over a true low-end Haswell platform, whether you were using a discrete graphic card inside your Origen, there would be no need for a more expensive Core i3/Core i5, as their major selling point for your tasks (a more capable GPU) would be pointless.
Summarizing, to talk about a possible system upgrade, I think you should point out more clearly your current requirements and setup.