Can I turn on turbo boost whenever i want to?
Intel Turbo Boost is a feature in Intel's latest CPUs that basically increases the frequency of one or more of the CPU's cores when in a high-performance state.
This is done automatically by the CPU.
Also how fast would I really need a cpu and how fast does 3.4Ghz feel like? I am using a 2.0Ghz processor right now so I have no idea how fast it is.
Higher CPU frequency does not always equal higher performance. The CPU's micro-architecture is typically the most important aspect that governs real-world performance.
ex.: A dual-core Pentium 4 @ 3GHz is much slower than a Core 2 Duo @ 2.4GHz.
Will the cpu I chose on this post be able to handle things like crysis or skyrim on high graphics settings?
Yes, the i5 2500K is a very good choice. Overclocks nicely too.
For ram I'm thinking 6 - 8gb but I dont know how much I would really need.
Unless you'll be using your PC for workstation purposes, you'll have a hard time using more than 4GB of RAM with today's current games (unless you like to multitask a lot), but to be future-proof, 8GB should be more than enough.
Next thing I need help with is the gpu.
Well then you're in luck, because nVidia recently released a video card at a very nice price point, the GTX 560 Ti Core 448.
Im probably thinking of getting an ssd but maybe an hdd if its cheaper.
Given your budget, adding an SSD would be too expensive.
Would you reccomend any wireless headsets? But ones that dont run on non rechargable batteries. And I will be using it for gaming, videos and some of the other things mentioned in 4.
I honestly don't recommend wireless headsets as those that run on rechargeable batteries don't last very long and/or are pretty expensive.
Since you said you would also use them for videos (and I also presume music), the
ASUS ROG Vulcan ANC is an excellent headset. It's wired, but you can disconnect the cable from the headset when you're not using it.
It also features noise cancelling, which really helps immerse you in games by limiting exterior noise (like case fans or the AC).
It's not exactly on the cheap side, but you get what you pay for in audio quality.
Razer and Logitech also make pretty decent gaming headsets.
This rig fits your demands nicely:
Motherboard: ASUS P8P67 (REV 3.1) LGA 1155 ~ $150
CPU: Intel Core i5 2500K @ 3.3GHz (3.7GHz Turbo Boost ~ $219
RAM: Corsair 2x 4GB DDR3 @ 1600Mhz Dual Channel Memory Kit ~ $39
Video card: ASUS EN GTX560 Ti Core 448 320-bit 1280MB GDDR5 ~ $310
HDD: Seagate Barracuda 7200.12 500GB ~ $95
Case: Cooler Master Storm Trooper ~ $190
PSU: Corsair TX650 650W ~ $90 (after rebate)
TOTAL: $1,094
And I would also recommend a good after-market cooler for the CPU:
Noctua NH-D14 ~ $90
TOTAL (with cooler): $1,184
With this rig you'll max Crysis 2 @ Full HD and play BF3 @ Full HD with high-ultra settings.
Skyrim doesn't require very demanding hardware so not only will you be able to max it out with this rig, but even use some clever tweaks and mods to further improve image quality.
There are some areas where you can trim on costs, such as exchanging the motherboard with something cheaper, but then you'll lose overclocking potential, features and possibly long-term system stability.
You could also go for a cheaper case and a cheaper (but less performing) video card such as the AMD 6870 or the nVidia GTX 560 Ti.
For the rig above, I recommend a 650W PSU, but if you change the GPU to one of those mentioned above, a 550W PSU would be sufficient as well.
You'll also need a 64bit OS to use more than 4GB of RAM.