Home Server Rebuild?

From: Wil Wade 
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So my power supply died again on my home server (1.2 years after last
replacement... again). And I am thinking it might be time to replace my
home server. Looking for some suggestions on what others are using. (Or
have unused waiting for someone like me!)

The main thing I am looking for is low heat or heat tolerance. The closet I
put it in does not have very good air flow (and also has the hot water
heater.).

What is on my home server you ask?
Ubuntu LTS
Tor Node (Relay Only)
Google Cloud Print Connector (and CUPS)
UniFi Gateway
PiHole
Plex Server
GmVault
Backups via Unison

I've thought about also dropping in a few other things like
[own|next|.*]cloud.
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