[wplug] Cheap linux server - hardware suggestions

[Vikram Sai Balaji Gmail]

I am looking for some cheap linux based server at home. 
	My aim is to run a server in either of the 3 modes
	1. to hold media content and stream to a Samsung TV / laptops via the network. The server should be able to download media files from internet, store them and stream them. (myth TV / ubuntu TV later on)
	2. In this mode i want the server to act as a local LAMP server
	3. in this mode i want the server to act as a renderer (i.e used for blender rendering).


I looked at a lot of motherboards, build your own stuff and professional sites but couldn't narrow down on any of the hardware. i need some guidance in determining the hardware. i will be using only ubuntu as the OS.

is it advisable to build a server or is it better to buy one from vendors? Has anyone got any suggestions on hardware on any / all of the above mode. Appreciate your help on this. Cost( 200 - 400).
Thanks
Vikram