Hello everyone. This will be my first build and so wanted to get your expert opinions. It will be mainly for processing home videos from a hd camera where 60p needs processing power using sony vegas, photos, tinkering with photoshop, multimedia, act as a home server for all of my media, etc.
Approximate Purchase Date: within the week
Budget Range: 900 after rebates
System Usage from Most to Least Important: internet, video processing, photoshop, home media server
Parts Not Required: keyboard, mouse, monitor, case, dvd drive
Preferred Website(s) for Parts: newegg, tigerdirect
Parts Preferences: intel i5 vs i7
SLI or Crossfire: Maybe
Additional Comments: quiet, cool, and most of all, reliable
Old case... As long as it was from a custom build, and as long as it has room for your motherboard, it should probably work. Prebuilt computers tend to have the back panel carved directly out of the back plate, while custom builds will just have a rectangular plate which can be replaced.
Check out the comparison of the 2500k vs 2600k here: http://www.anandtech.com/bench/Product/287?vs=288
The main difference between the two is that the i7 supports hyperthreading (HT) (basically where each core pretends to be two cores, so that if one thread is waiting, the other can go. Typically you will only see a 5-10% increase going from non-HT to HT. Best bang for your buck is to go for i5 2500K with decent aftermarket cooler and the overclock the crap out of it...)
Make sure you get the ****K models, as those are the ones that support overclocking.
If you're overclocking, get an aftermarket cooler of some type. I don't know a good one, but you should be able to search around for a decently quiet one...
I'd go 16GB of RAM and not have to worry about it. RAM is cheap these days...
Depending on what you want in a case, if your current one doesn't work, the Antec 300 and the Rosewill CHALLENGER are both solid choices at bargain prices.
When you're checking out cases, you'll want to see
A) How many hard drive spaces they have (and how many you need)
B) Whether or not the hard drive bays are rotated 90 degrees (makes it easier to service but may restrict airflow)
C) How many fan bays they have and what size of fans they support. Bigger fans can be run quieter.
D) Will it fit your motherboard (so if you have an ATX motherboard, don't get a microATX case)
And just a FYI I posted this as I wait for the caffeine to die off so I can get to bed, so I apologize for any incoherence...