A couple of quick points:
- the faster internet connection being offered is 30Mbit/s, not 13 (although whether you would actually ever achieve close to that speed to any overseas sites is debatable.
- that 30Mbit/s deal seems a little poor. I am paying $227/month and that includes the modem/router rental and a couple of free premium channels (as well as all the free ones).
However, I didn't get the Wellcome dollars, so if you call that $20/month I guess there's less in it.
As far as I know I don't have (and have no need for) the 3G or wireless stuff.
At 30Mbit/s they give you a box which is both a VDSL modem and a wireless router in one. You can't (except with a lot of technical faffing around) use your own modem, but you could put your own router behind that box if you wished to.
To get NOW TV you need a NOW TV box (which you must already have since you say you have been paying for some premium channels). If you don't pay for any premium channels you will still be able to watch the free ones that come via that box.
You quite possibly also have a straight antenna connection to your TV from the wall, which is linked to the building antenna system and is nothing at all to do with NOW/Netvigator.