Its not really feasible to try to use a server at home...unless you REALLY know what youre doing...because there are some basic differences....for instance, often servers can ONLY use "registered" or "ecc" ram..which costs more.
There are other differences etc.
That being said...lots of people have bought the Dell server..I cant think of the model right off hand....400c 600c..something like that, lol.....there are articles etc showing how to use them for home use etc. Dell has them as low as less than $300 sometimes.
But frankly its more of a hassle and there is no real benefit. The regular home computers nowadays are so powerful that a server for home use doesnt really make sense to me.
------
here is a decent MSI motherboard that uses both types of memory
http://www.newegg.com/app/ViewProduc...130-404&depa=0 it has onboard video,sound,lan. It will take up to an athlon 2600+ thoroughbred processor.
there is also the ECS K7s5a but frankly it is a little picky..I wouldnt recommend it for newcomers...
http://www.newegg.com/app/ViewProduc...135-126&depa=0
-----
here is an Athlon XP2000 cpu
http://www.newegg.com/app/ViewProduc...103-383&depa=0
you can get the athlon and the MSI board for $114 shipped...that would be a major upgrade from what you have.