The pricing for RHEL 6.3 ( the current )
is $49 to $299 per year
and if you have to ask the $299 is probably your best bet for the first year /
one of the free rebuilds , but then you are your own tech support
but do not expect
RHEL ( or Cent) to be GREAT home desktop Operating systems
it was never designed for home use .
A lot of normal everyday things are not installed
like support for mp3's , or videos .
I use ScientificLinux 6.3 but NOT as my normal everyday OS
for that i run OpenSUSE 12.1 ( soon to be 12.2)
the SL6 install is for running some programs that are designed for the University lab settings
They NEED a very stable
and not changing OS
In RHEL the major versions of programs will NEVER change over the 10 year life span.
This is good for the server rack ,or the Laboratory ,or the office , but bad for home use .