Very satisfied with this refurb'd Optiplex 990 i7
Originally priced at $299, this was a bargain for an i7 and came with a 1 year warranty. Had no issues at all with fresh Win10 OS installation and setup. Be aware that you'll need a VGA cable but it does support 1920x1080. If you want to add a graphics, sound or other card, you'll need Small Form Factor (SFF) cards with Low Profile (short) brackets. These are kind of rare but there are some here. I found a nice SFF 5.1 sound card with an accessory LP bracket that worked just fine.