Seeking recommendations for a home office chair

I'm finally upgrading all the stuff in my home office, and one of the things I could really use is a better office chair. Currently I'm using a decently-comfortable mesh-back chair from Ikea, but with my various keyboard experiments I'm finding that I really need something with padded, adjustable arm rests. I'd like a chair with the following aspects:

  • Good lumbar support
  • Has padded arm rests with decent range of height adjustment
  • Arm rests should be easily removable or stowed out of the way
  • Adjustable seat tilt, ideally with forward tilt as well (although that's not required)

At work I have a Herman Miller Aeron which is pretty good but there's no way to get rid of the armrests, unfortunately (also it's preeeeetty expensive).

Another possibility is to clamp some armrests onto my keyboard shelf (which is actually a laptop stand I modified to just hold my keyboard and trackball) so that I can also still have decent armrests when I have it set up in a standing configuration. Has anyone ever used those?