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ive been grabbing hp elitedesks on ebay for like 75ish bux, low power consumption and most come ready to use, just make sure it has the power brick

If you want new, I've used some Asus PN50 mini PCs (now superseded by PN51). Add 64GB RAM and 2TB M.2 SSD. Has 2.5G NIC which is nice.

If going for an Intel NUC you'll want at least quad core CPU (so 8 cores with hyperthreading) so 8th generation i5 or i7 NUC or later