Help making a Home Data Minig Server

[Modnar]

I am looking in buying a GOOD File server. Money will not be an issue(to some extent more around 10,000 is my stopping point but trying to make it like 4 to 5k). It will need to be easy upgradeable, like w/ hdds and kinda like a blade server. I am mainly looking for about 20tb or so but will probably start out w/ about 4 or 5tb. I will probably do RAID 6, and any advice here would be much help. I am usually buying SAMSUNG SpinPoint T Series HD501LJ hdds. I try to stick to 1 hdd that i buy and this 1 is awesome. I am probably going to use Linux on it. VPN will come in to play after a while, so i need advice on which router/switch to buy as well. I'm torn between buying like a hp server or building the server myself. So if any has any advice on what to get please let me know.