I was also just able to get a geekdesk max- highly recommended. Solid construction and easy to switch between sitting / standing.

I've been standing for 1 year now. You're right about the ergonomics of having your arms parallel to the ground and the monitor top at eye level. You'll also want an anit-fatigue mat. The Imprint Cumulus Pro Commercial sounds good- going to try it out next week. The anti-fatigue mat is probably one of the most important parts. I started with the standesk 2200 (google it for plans / pics) - the ikea hack where you attach a shelf on brackets to the $8 Ikea Lack table. You can just set this on top of your normal sitting desk and see how you like standing for around $25. You'll definitely want an ant fatigue mat to go with it- and a firm one is good so you can shift your weight from one foot to the other and not have your foot sink in too far. I actually just got upgraded to a geek desk max- and I can highly recommend this solution. It's adjustable and even has presets for sitting / standing heights. Being able to stand AND sit is ideal- I always try to sit during meetings and take a good sitting lunch break. Using a wacom tablet is also helpful in terms of ergonomics for my wrist- but I'm often using 3D DCC applications rather than coding or or other IT work. I intitially started standing after having a lot of back and neck pain from working 70+ hours during crunch time. I was physically wrecked by sitting so much. Now I'm excited to go home and sit on the couch. And yes- I do find pain relief from sitting and standing during the day. I probably stand around 6 -7 hours a day. The first week is the toughest, but it gets easier.