(Image credit: Future/Sihoo) I've been reviewing ergonomic office chairs since Covid 19 so rudely forced me to sit on my spare kitchen chair at home for work. A severe back ache ensued, and I got into office chairs for back pain quick smart. And it wasn't long before I discovered the Sihoo M18 – the best budget chair that punches well above its weight as far as adjustability and comfort. And six years later, it's still the best budget chair I can find. And things get crazy when that excellent $170 chair is reduced to $133 over at Amazon . If you're looking for a quality office chair for your home office, and you want (quite a lot of ) change from $200, I don't think there's a better option out there. The Sihoo M18 received the first perfect 5/5 review , and remains the best budget option in my list of the best ergonomic chairs . It's really very good! The Sihoo M18 is a budget ergonomic office chair that looks a lot slicker than the price tag would have you believe.…