@John1967 it is a good step forward, building your own PC...Though initially it may look complicated and tough, but once when you are done with it, am sure you will feel very happy and confident...And also you wont have to rely on someone to fix your PC if anything goes wrong...
But a word of caution though...you can expect some components that may come DOA...So be ready for that too...but am not saying that it will come but it may...
Now as for the parts...
1. CPU - Good choice for your usage...
2. Mobo - Why do you need the UD7 ? Will you be overclocking extreme ?
Save some money and get any of these...
http://www.newegg.com/Product/Productcompare.aspx?Submi...
3. RAM - 12GB if you are into photo editing/ rendering and stuff...
2 of this kit....
GKSillz 1600MHz CAS 7
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
4. CASe - A very good and huge Mid Tower -
HAF 922 - It is pretty fancy and has very good airflow too...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Another option
LIAN LI Lancool PC-K62 Black
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
5. Graphics card - You wont be playing games on the PC right ? Then why do you need the HD 5850 ? IMO even the HD 5770 would suffice
Aftermarket cooler - runs cooler and noise is less...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
6. HDD - Don't get the Raptors...IMO they are not worth the price...
I would suggest this kind of setup...
SSD - For OS and apps
Intel 80GB - Nearly instant access of apps and very fast boot times...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
1TB HDD for others...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
7. Sound card - IMO the ASUS Xonar series are a better buy at that price...
http://www.newegg.com/Product/Productcompare.aspx?Submi...
8. CPU cooler- CM Hyper212+ or for that price, Xig Dark Knight
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
9. BD Burner
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
DVD
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
10. Most important - PSU -
850W ? Why do you need that much power ?
IMO this would suffice...Any by no means this is weak or doesnt have enough power for future upgrades...
Corsair 650HX - Even the 550W would suffice but keeping in mind future upgrades, this is a safe bet...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
But if you are willing to spend a little more on a very high quality PSU, that will run virtually silent, then this one for sure...
SeaSonic X650 Gold 650W - 80+ Gold, It runs so cool and efficient that the fan on this PSU sometimes doesnt even run...Though it commands a price premium, but well worth the price if you want a highly efficient and silent PSU...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
And do look for combo deals on newegg...
Some guides to help you with building...
http://www.tomshardware.com/forum/274745-31-step-step-g...
http://www.tomshardware.com/forum/261145-31-read-postin...
And you do get so many youtube videos too...