The cache will make performance somewhat higher, particularly for media.
Not vastly, but some. I would go for the VT, because you don't know what
software you will want to run in the lifetime of the system. There might
be some great new application out which uses virtualization, or you want
to run a web server in a virtual machine, or ???
My read is you are sure it will be faster, and you buy insurance against
some new software making your system unsatisfactory. Sounds win-win to me.
SBC/Prodigy Yorktown Heights NY data center