S3.
I would get the Galaxy S3.
Both the Samsung Galaxy S5 and Galaxy S3 have micro-SIM cards. So, it should work.
Yes
To root a Galaxy S3, see the related link below.
No, the Galaxy S3 does not have a built in HDMI port.
No, The Galaxy S3 Does not have an HDMI port built in.
Nope! It's smaller than the S3.
The Samsung Galaxy S3 was released on May 29, 2012.
Yes, the Samsung Galaxy S3 comes with a pre-installed texting app.
Yes, the Samsung Galaxy Ace is older than the Samsung Galaxy S3 Mini. The Galaxy Ace was released in January 2011, while the Galaxy S3 Mini was launched in October 2012. Thus, the Galaxy Ace predates the S3 Mini by nearly two years.
Ideally, S3, but S2 would be better than the iPad and cheaper than the S3.
The battery of your Samsung Galaxy S3 lasts for about 4-5 hours if you are only talking on the phone, and fewer hours if you are surfing the Internet.