If your going to be doing allot of push ups make sure you get some push up stands. I got mine for about $20 at Dicks. They really make push ups nicer to your wrists.
You may have just solved a mystery for me. Cardio kickboxing class I've done past 2 months has lots of pushups. And my wrist has been really bothering me. Assumed it was from increased computer mouse use (major work project). Probably combo of both but I'll try the stands and see if it helps. Wrist support for the mouse has helped a little. Thanks!