It will be enough for what you have assuming you don't have a plethora of other devices HD's, sound cards, etc sucking up juice. You won't have any real headroom for upgrading later though.
Assuming no OC on the 2600k its peak draw will be ~100w
Video card is rated at 65w but I would assume a 100w peak to be safe.
Motherboard will probably pull another 50w or so
Misc other devices another 50w
So you are looking at around 300w or so which is fine for that PSU. If you were to upgrade to any mid/high to high lvl video card though you would definitely be pushing it, if not exceeding it on peak demand. It also does depend on how that power is distributed across the PSU though, many PSU's are misleading, they will say 550w but a lot of it might be wasted on unused rails. The demand of that video card is very low so you will be fine most likely even if it is not a "true 550w"
I always recommend buying a high quality power supply, many people skimp on this when it is one of the more important parts of your system.
Personally since you are looking at a lower end system I wouldn't bother with a 2600k since you wont have the hardware behind it to really OC well anyway. Save some money and get a 2500 non K series and put the $100 savings into a better video card.