My windows surface pro 3 just died and i am looking for a solution that address the following:

At home I watch netflix, but at my girlfriend's place the wifi is very bad and so I have to download (pirate bay) shows and hook the tablet to her non smart tv in order to watch our series. I need a device that must:

1. Have regular wifi function
2. Run netflix
3. Run android or pc torrent software
4. If its android it must not depend on a pc
5. Accept micro sd cards
6. Be powerfull enought for running office (windows or android based)
7. Be portable
8. Be a quality, well reviewed product

Note: i have a phablet with plenty of storage and miracast capabilities where i do all my web browsing. My ps4 satisfies all my gaming needs.

What is the most cost-effective solution you guys can think off?

I would appreciate any comments; i have looked at buying a compact pc (preferred not to spend much), An android tv, a miracast dongle, a chromecast, a cheap laptop (can be very frustrating if it has low performance)