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Four boxes on a table?

Sitting itself is not such an issue. The intermediate (hidden) variable is sloth. Take breaks, every hour, and move during those breaks. If you have a tablet or a notebook, use it to read your email/HN standing up. etc.

I love my ergotron work fit which is basically an attachment that clamps on any desk and lets you raise and lower the keyboard, mouse, and screen ($250-400 look at all models and find deals online). I find myself standing for about half the day. I've read that the opposite extreme, standing all day, has its own health concerns.

I've got the following Ikea desk at my office which is great, they are about $140: http://www.ikea.com/us/en/catalog/products/60111123

All three levels are adjustable.

Yes, see what I just posted as a reply to the GP. http://news.ycombinator.com/item?id=2957403

pullup bar ?

(even if you are not strong enough to do pullups, you can hang or do "negative" pullups)