Really? I've had nothing but good experiences with AMD. Anyway, and Intel is either outdated, or out of your budget. Yeah, the PSU is pre-installed so it's easier. Plus there's headroom for overclocking on the AMD.. however i'd suggest getting an aftermarket cooler for it if you oc it.
both xenon and i5 would be out of your budget range. Something like i3 or even pentium would do well, i don't see a server in your situation (for media streaming and hosting) needing a lot of processing power, not like you are going to do some heavy calculation on it.
You might also want to look at networking option in your build and get a motherboard with better Ethernet connection. You don't want to be bottle necked by a slow connection.
Okay. Great answer.
So that meens, for the purpose stated in forst post, i don't relly need a big CPU.
Regarding the network, am i limited to a 100/100 connetion, and if in the future gets bigger, a new card cost's nothing.
As all of my other systems Workstation, Laptop, HTPC are built around the AMD AM3 platform I decided to followed suit with my server. I picked up the components on the cheap over the course of 3 months but I only spent $180. I had access to windows server 2008 r2 for free so that saved a big chunk of money. I built my server around a recycled sempron 140 processor that I received for free for upgrading a friends computer. It draws very low power 45w and i've been very suprised by its power for a low end chip. Eventually, once I upgrade my workstation in a couple years I'll swap it out with my 6-core workstation CPU. That being said If i were to build a server today and wasn't locked in to any particular platform I'd probably go with a build like this.
Total I get is $395 after rebates but plan to add more to that total after you figure in shipping, obviously I don't know where you live.
Although the CPU is a Celeron its built on the new Sandy Bridge architecture and will be very low power for the performance you get. There's definately some wiggle room with all the parts as with your 500$ budget you could still add another HDD for storage and leave the HDD I chose as the boot drive.
pjl21 is correct you don't really need a big processor for a server I'm running mine on a single core sempron. Its best to have atleast a dual core if your planning on encoding. If your server needs increase you could always upgrade to a quad down the road once Ivy Bridge is released and the prices for Sandy Bridge decrease...leaving you a spare Sandy Bridge Celeron to build a HTPC around...Good Luck!