H.S.
Abbie,
Digital photo frames have come a long way, but are definitely not perfect. I can recommend the Philips frames as they are one of the few that deal with pictures of different sizes and orientations. That is, they adjust reasonably well to portrait vs. landscape vs. square pictures. Check out
http://www.amazon.com/Philips-6-5-Inch-Digital-Photo-Fram...
Now, on the wifi or wireless front, the technology is limited. While there are frames that allow wifi for a reasonable price (e.g., http://www.amazon.com/Samsung-SPF-83V-8-Inch-Wireless-Dig...) the assumption is that the frame is being updated from a PC within the same local network. I suspect you want to give this frame as a gift and then send updated pictures to it remotely. Consider this alternative ...
Purchase at least 2 SD cards (instead of 1) -- look out for sales from Buy.com. I purchased 5 1GB SD cards for $20 (including tax and S&H). That was $4 a piece. When I gave the frame as a gift, I loaded it up with favorite pictures on one of the SD cards. Twice a year, I update pictures and send one of my spare SD cards to my sister-in-law. She swaps out the SD card and sends me back the one that was in her frame. It works well. The SD cards are easy to mail or if you're going to see the person, you can just swap out the SD card in person.
I like "having control" of the SD card update because I can verify on my PC that the pictures show well and are in the order I want etc. before sending the updated SD card.
Good luck,
Elizabeth