Another cheaper option is a standing desk with a high office chair. I used one of these for about two years and it did make a positive difference. You can stand or sit and it costs no more than a regular desk. (My workplace uses desks from Ikea, they are cheap and comfortable) Unfortunately, I like to switch between 'sit', 'stand' and 'slouch'; slouch being reserved for when I'm really "in the zone". I missed that op…
The slouching when in the zone is true for me as well, which is why the pure standing or standing / tall sitting are not a good option for me personally. They just kill certain types of productivity. Adjustable sit-stand desks are just unbeatable in terms of being least disruptive. Whether the cost can be reasonably written off as an investment in better health and productivity really depends. Long term, I think it's…
My dad's drafting table setup was similar to this.