I have to say your current computer is more than powerful enough for
your current uses and I would advise saving your money instead, perhaps
instead just buy a SSD for the primary drive and some storage disks for
storage.
Your current system is also pre-PSP so it lacks AMD's version of the
evil ME thus I very much suggest keeping it.

If you insist on upgrading I would consider:
* The OpenPOWER9 TALOS 2 Lite which is an owner controlled open source
firmware workstation (the only blob is the NIC firmware which they are
working on freeing[1]) - the base 4 core CPU idles at around 10W.

[1]It was considered a better choice than using an intel NIC, and the
system IOMMU protects from potential malicious DMA.

* Another good choice is the KCMA-D8 which is the last and best owner
controlled x86 motherboard that supports libre firmware via
coreboot-libre or libreboot - as you are using it for a low power server
I suggest obtaining one of the low power "EE" series 43xx CPU's with
their max 35W TDP which idle at around 20W per 4 cores and are good
enough to watch 1080p movies on. The KCMA-D8 can now use OpenBMC[2] if
you obtain the optional ASMB4 or ASMB5 BMC firmware storage module.

I have a few of the pre-PSP Socket C32 computers and I am quite
satisfied with them and their power consumption, which is much better
than the Socket G34 systems such as the KGPE-D16.

[2] The KGPE-D16 and KCMA-D8 have the facebook OpenBMC whereas the TALOS
2 has the better (in terms of features) IBM OpenBMC however both are a
secure open source remote access solution which is much better than the
proprietary junk shipped with the modules.
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