I know nothing about the Minolta DiMage 7i but I have the Nikon 5700. I really love it. I have used it professionally, and it takes outstanding shots. I used it for print ads (extreamely large tiff files), the company I was working for sold psoriasis medication and I needed to take some very close shots. People in my office made me turn my desk around because the details on my computer screen could be a bit too much for some with weak stomaches.
I love this camera. It feels good in your hands. I love that when I forget to take the lens cap off, (blond moment, or senior moment) it is attached in a way that wont interfere with the lens motor. I did a number on an olympus camera that way. DUH.
It has 4 user settings that can be pre-programmed. You can have one set strictly for night shots, which is really the only real problem this camera has. It took me alot of practice to get used to it not being very good in low light. Breathing while taking a photo will cause blur. You will need a tripod or have something to lean on while taking shots. But that goes with digital cameras anyway, I think.
My DH cannot use this camera, being very left-handed. Also his hands are pretty big and the flash button is on the left so he ends up turning it off alot. And the flash pops-up on the top, so watch where you put your hands.
You can look at your photos right away, and throw out what you dont want. It also comes with a cable to plug into your TV so you can really see how they look. That comes in handy when you cant download them to your computer right away. Like in your Disney hotel room.

I will post some shots I have taken, if you'd like. If you'd like more information, let me know. I think you'll be very happy with this camera. I am.
*photos in low light, no flash:
http://disboards.com/showthread.php?s=&threadid=431262