Before dumping the money on a geek desk, you really ought to try a hacked-together solution for a week or so. There's the $20 IKEA hack option or you can just stick a chair or a box on your desk.

You may end up finding your prefer a specific configuration and look at other standing desk options.

Also, in terms of sittings vs. standing and sore feet. I've been OK with comfortable shoes, but I'm close to getting a standing mat. There are some pretty pricey ones on Amazon, but Uline sells standing mats for $30 that are probably comparable to the expensive ones.