Here is a very helpful thread for what you're doing...
http://www.tomshardware.com/forum/264258-31-system-editing-adobe-premiere
With that being said..
If you stick with a 1156 socket cpu, you will be tied down to a max of 8 gb of RAM...with the 1366, you will have the 12 GB limit
I was in the same basic situation you're in now...I bought the HD TV w/Blu-Ray and a HD video camera (AVCHD)
Here is the system I recently just built:
I7 920 - Microcenter ~ $230 (if you live near a Microcenter, if not $280)
CPU cooling -
http://www.newegg.com/Product/Product.aspx?Item=N82E16835608014 - $75
The Dark Knight is ~$45, which is also an excellent choice, however I read many reviews that had the Noctua being very quite...and it is...I have it running max RPM and it's quite...I have a Antec 1200 case with all 6 fans (stock) running at the min RPM, the Noctua running at max, the PSU fan, and a GTX 275 graphics card fan running ... and my old Dell 8400 is the louder of the two systems, with ONE fan for the CPU and ONE fan for the PSU.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029 - Dark Knight - $45
MOBO - EVGA -
http://www.newegg.com/Product/Product.aspx?Item=N82E16813188046 - $250
Power - Corsair 850 (non-modular)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139009 - $120
RAM - OCZ Gold -
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227365 - $112
Burner - LG Blu-Ray burner -
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136164 - $200
I bought this burner because I wanted to be able to burn Blu-ray...if you don't have the blu-ray requirement...you can save a chunk there and just get a DVD burner...
HDD's - I went with this configuration:
- One - WD 640 GB Black Edition -
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319 - $75
- Three - WD 1 TB Black Edition -
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136284 - $195
I have the 640 for OS and Programs and the two 1 TB's in RAID 1 for storage and one 1 TB for (external) backup
Case - Antec 1200 - ~$135 at Microcenter
Graphics - EVGA GTX 275
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130478 - $240
OS - Vista x64 w/free upgrade to 7 -
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116677 - $110
The total cost for that system - ~$1,840
Now, given that you will not be gaming, you will not require the GTX 275...So, I would recommend this graphics change to allow more invested in another 6 GB of RAM...
GTX 260 -
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130434 - $160
Unless someone can come back and recommend a good workstation card (don't know those very well).
I also wanted the EVGA MOBO...ASRock has this...
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157163 - $160
With that MOBO and the GTX 260 and ADDING another 6 GB of ram, bringing your total to 12, you're sitting at a price of about ~1780
Power supply savings can take you down to $1740
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004 - $70
I went with the 850 for SLI and Overclocking
you can save another $100 by only using two of the three 1 TB hard drives I have on this list...you've already got the back up solution.
Now you're down to $1640
My thoughts on only getting two hard drives at this point is because technology is changing so fast that I figure I'll add more hard drives as I need them...no sense spening the money now when later I may be able to get twice the storage capacity at the same price...and this is one of the easiest components to add.
Being that this price is at about $1640, if you did not want to have your scratch drive be the OS drive, you could do a RAID 0 with a set of WD 640's and that would put you right at the $1,800 limit.
Like I said earlier, if you went with a dvd burner instead you can save about $170
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136144
Lots of possibilites to consider...let us know how it goes.