I am doing some upgrades and a big part of that for me is aesthetics and future upgrades.
I currently have a couple 7020 I5 Dell Optiplexs but I am thinking about purchasing a couple Dell R210ii.
Is this a crazy move? I love the idea of a small 1U rack mount server and plus they are cheap. I can pick them up for $150 while I would be paying $150 alone for a chasie.
I still run an aging R210ii, and it's been great. Mostly....
If you're going to use the server for storage (or I/O heavy tasks), you might be better to get the Optiplex since it has SATA-III (6 Gbps) and the R210ii only has SATA-II (3 Gbps). The R210ii also only has one PCI-E slot which limits expansion options.
I would stick with the 7020's or get something smaller like a Beelink unit that seems to be all over tech YouTube right now.
The r210 is loud due to it being a 1U server. The upgrade path on the r210ii is very limited. Look up the Dell Technical Guide for the r210ii to get a list of what you can upgrade them to as far as CPU and RAM requirements. It only takes up to 32gb of ECC UDIMM which I always found more expensive than ECC RDIMM. For CPU, the best CPU it can take is only a 4 core, with no hyperthreading.
Experience: I have run two r210ii's before moving to three r230's before finally going big to a r730xd. In the past month, I have migrated away from the r730xd to a Dell 5820T and 3x Dell 3070 SFF PC's to combat the noise and heat generation in my home office.
I have an R210ii running opnsense for like 6 years now. It has never given me a single problem and easily my favorite little machine. And the oldest in my rack.