I don't understand the attraction to non-adjustable standing desks. Standing all day seems just as bad as sitting all day, especially if you start standing all day after sitting for years. As long as you're relatively active (~3hrs of exercise/wk) you're probably OK just standing an hour or two a day.

I opted for an adjustable standing desk that I love. After doing a lot of research I ended up going with a brand called EvoDesk (http://www.evodesk.com). Their parent company is NextDesk, which has nice products, but cost more than I was willing to spend for what I wanted.

I ended up getting the smallest desk they have (48"). With all of the options, including the speakers it came out to around $1,000, which I consider reasonable for a tool I use ~14hrs a day, ~everyday. Though, I ordered the keyboard platform add-on, but didn't like it (I'm fairly tall) so it's sitting in the closet.

I've had it for a couple weeks now and love it. I stand anywhere from 1hr - 6hrs/day depending on what's going on. This isn't the best image of the desk, but I took this picture the other week for a "show us your office" thread: http://imgur.com/ybIEoqB The desk is at sitting height. The bubble looking thing under the desk is the subwoofer for the Harman Kardon sound system option that came with it. You could probably order it for $30 or so cheaper separately on Amazon, but I didn't want to hassle with drilling/finding my own screws. It has 4 height memory presets. I'm 6'1" and the highest desk height is about 6" higher than what I use standing.

Now that I have a standing desk I can't imagine going back, but I'd definitely want an adjustable desk. If I had to choose between a fixed sitting desk or a fixed standing desk I'd choose a fixed sitting desk.