2 ways to do it... either get a full frame camera and shoot with lens wide open. the vignette that you see is actually an effect created by the lens. if your lens does not have this, then you can do it in photoshop. Either a vignette plug in or get a burn tool, zoom out of the picture, make...
How much is your budget... i would stick to Canon and Nikon if i were you. more resources to tap into. the Nikon D90 is a great camera. with canon, i suggest the 50D and up.
the window could have been improved if you had completed the writtings on it... if possible only. :) nice light though... and you've got a very lovely wife. I admire you for posting it... i love my wife too! :)