just be prepared to wait if you want SSDs
Was going to order a single socket dell server for myself (to replace an older system I have at a colo). Tried to put a pair of 400GB SSDs in the system, and the website gave me a roughly 60 business day lead time. Without the SSDs the system could of shipped pretty quick, though I couldn't get a valid configuration the website kept complaining about the operating system, and the things it told me to do I either already did, or what it told me to do was impossible (one suggestion it had was to choose "no OS" option, and there was no such option). So I guess when I actually order it I will have to call them.
I know there is a broader SSD shortage and this problem is not specific to Dell, but was still surprised for just a pair of small SSDs the delay was so long. I had read before that it seemed like the most popular SSDs were in the 2-4TB range and I expected shortages on those, not so much 400GB.
I would of bought HP but they do not offer the CPU I need(none of their systems in their online store have it anyway), which is an Xeon E3-1240L V5 (2.1Ghz quad core 25W - I could go with the 1235L V5 as well but not even Dell has that chip).
Not sure why that CPU is so rare, seems nobody other than Dell has it (several online retailers claim to stock it but they do not actually have them in stock, I waited 6 weeks for one such retailer to ship before cancelling an order earlier in the year). Note this CPU is "L", lots of websites have the E3-1240 V5(80 watts!), but not the "L" edition(25 watts). I built another server with this CPU earlier in the year (CPU came from Dell as well). Really like the low power profile, yet still a very functional and quick processor.
I was interested in what AMD had to offer but their latest chips obviously don't come close to this power envelope. Maybe when they come out with their laptop chips next year they will release updated server chip offerings with lower wattage.