We are definitely going to need more information than that. Is the $6000 including the Server OS? What OS? Windows / Linux / Unix / Solaris, etc. What is this server to be used for? Just a file Server, Domain Controller, Exchange Server, SQL, Oracle, etc. What kind of environment is it going to go into? (Dusty, into a Colo, inhouse Datacenter, etc)
When you're doing up a server for a business, it's quite a different ball park from the standard system at someone's house. Even a high end rig at someone's house wouldn't be in the same ballpark for planning and such as a mission critical system like an all round server.
I manage over 300 Servers (Windows Server 2003 - 2012R2, our Unix Team deals with the Red Hat, and Solaris systems) spread out over 19 countries, in 9 different Data Centres, running in a mixture of vmWare, Hyper-V, and Azure. I can tell you, the amount of detail you put into it right in the beginning is going to save you a lot of frustration, and heart ache in the end.