I’ve been considering a standup desk for some time now primarily for the health benefits. After some research, I decided to purchase the Ergo Depot Jarvis standing desk. Overall it’s been wonderful. It raises to a max height of 51″ which is suitable for someone like me who is 6′ 5″. Check out this calculator to estimate the correct height. It is very well built and feels sturdy with a 350lb lifting capacity. I plan to buy a standing desk mat to improve the comfort when standing for long periods of time.
Another option is to buy just the Jarvis frame and build your own top. This would allow you to customize the desktop and possibly save money. I also noticed (after I purchased mine) an open box special that is $479.
The kit I purchased came in 3 in the boxes. The desk, frame and a adjustable monitor mount, that I highly recommend. The desk took approximately 3 hours to assemble. Some of this time was spent organizing cables using zip ties.