Somewhere in my collection, I still have a large cardboard box with loads of "rounded" IDE and floppy (1-device) cables. I bought them when they went on sale at svc.com years ago, and I still haven't managed to divest myself of them. Do yourself a favor, get rid of them sooner than later.
I wish I had some customers for a number of desktops I've built over the years in an attempt to sell. Seems most people, just use theirs until it dies, then they either go buy a laptop, or another desktop, whatever the current one is at BestBuy or Dell.com. Seems like only "gamers" want custom desktops. That, and all of my family and friends (they are all "desktop people", for the most part), except for my Mom, whom seemingly only uses her laptop anymore. (She has multiple laptops and desktops, that I've built her over the years.)
As far as "new" desktops, I've got:
Intel H61 / G1610 / Ivy Bridge dual-cores
AMD A55M / A4-6300 / Richland APUs (kind of not-quite-snappy, though that may have more to do with inclusion or lack of dual-channel than anything else)
AMD AM1 / Sempron 3850 quad-core APUs (slow, very slow, in Firefox, but CloudReady / ChromiumOS / Chromium is actually quite speedy on these.)
Intel H81 / G1820 / Haswell dual-cores (These are actually still pretty speedy these days, surprisingly, with enough RAM and an SSD)
Intel H81 / G3258 (4.0Ghz+) / Haswell overclocked dual-cores (I have some of these in custom SFF cases, I call them "Facebook rockets".)
Intel G3900, G4400, and more recently, G4560 CPU-based rigs, with DDR4 and SSD. Also some gaming rigs based on these, with 8GB DDR4, and a GTX video card. These are still pretty current. (Would be nice if I could sell one or two. Although, I've sold one to a friend, with a Z170 ATX board, 16GB DDR4-2400, and a 240GB SSD, on a two-year payment plan.)
AMD B350 / Ryzen 3 1200 CPU-based rigs (These are my most recent build(s). With PCI-E M.2 NVMe SSDs, they should fly. The one I've built so far, I overclocked manually to 3.80Ghz. Still, the SSD I put in, was only a 128GB TLC, but with an SLC cache (Plextor), but it seems a touch slower at writes than a SATA6G MLC SSD.)
Edit: Oh yeah, forgot the two:
AMD A55M / A4-3420 (FM1) APU rigs. (Bought these parts based on waltchan's suggestion. So far, I've given a few of them away. They're actually not horrible, when running Windows 10 Home and SSDs, and 2x2GB DDR3-1600 (dual-channel is mostly a must for AMD desktop APUs). They are able to overclock, but not by much, unless you switch from AHCI to IDE mode for disks, which cripples the SSD nearly as much as you gain from the increased CPU performance, at least for web browsing tasks. I would consider them almost as snappy for web browsing as the G1820 CPUs, when these A4-3420 APUs are overclocked over 3.0Ghz,)