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Can you help me with my capacity planning?

I'm planning to start my own high-performance server and then use collocation services for keeping it up and running.

I'm planning to USE it for processing videos and keeping big video site up! (using FFMpeg, MENcoder and etc.)

I just need recommendations on whether listed hardware is good enough and will work together well and fast enough. Do I need anything else (missed something). I remember about CPU coolers though! ;)

I'm planning to use SSD drives so please tell me if it's going to work just as regular HDDs (but much faster)? Are they going to be used as RAID (is this possible for SSDs)?

Here is what I would like to get:

1. Intel ® Server System SR1600URHSR (Urbanna) or Intel® Server System SR1695WBAC
2. 2 x Intel Xeon X5650
3. 4 x 16Gb DDR-III 1333MHz Kingston ECC Reg (KVR13R9D4/16)
4. 3 x (or maybe 4x) 480Gb SSD Intel 520 Series (SSDSC2CW480A3K5)

Which server system would be better? Is listed hardware new/good enough and worth buying it at the moment? Should I probably take a look at something slightly more expensive but more up to date and powerful, may be?

After all as software I would like to use CentOS 6 64 bit + WHM/CPanel? Any other suggestions on maybe cheaper and same/more powerful server management system but WHM?

What most important points to keep in mind when starting/maintaining your own server?