Suggestions? on CPU/other Parts.

First of all, this is mostly a general computer question. I don't really know where to put it in sub-category. so sorry if i placed it in the wrong category.

I just got bunch of new parts that include: Radeon 7970 GPU/1000w 80plus Power Supply/COOLER MASTER HAF X RC-942-KKN1 Black Steel (Full Tower)/ Intel 520Series 120GB SSD.

In like a month or two i will be trying to get a New CPU / MotherBoard/ RAM/ Maybe upgrade to a fully water cooling system/ and maybe a better HDD (Right now i have a 500GB)

I was looking into the Intel i7 3770K. Maybe the 3930K.
I have no idea what to look for in motherboards.
and will probably want 16-32Gb or RAM.

What i would like to know, What parts would you guys recommend? Second, do you guys think it will be necessary for me to get a fully water cooling system? Thirdly if i decide to get 2TB of HDD, should i just get 1 singular HDD or 2x 1TB HDDs? and lastly, you think it is necessary/good to get a sound card? right now i have a SteelSeries Siberiav2 headset that has a USB Soundcard, so i don't know.

NOTE:
This computer will be using for mostly gaming(heavy gaming)/small part of 3D modeling/ architectural drawing.
I will have about a $2000 Budget.
and Also, i have no idea how to overclock. i just know that overclock is used to make your CPU faster but heard it lowers the CPU lifespan. So idk if i will be overclocking.


Thanks a lot.