While we are happy to help people fix problems, we aren't here to do extensive research on purchasing choices. This is a help on problems forum. I would suggest you do the research on the devices. Most info you can get online about the phones and then go to sites like gsmarena.com and others to find out the specs of a device.
Now if they will work with AT&T is a guess. You would need to make sure the device is GSM and not CDMA, which isn't always listed. AT&T uses a GSM network. So after you have narrowed down your choices, you would be best served to contact them directly to see if a particular device would work.