I know you were talking to Kieron, but I'll jump in ahead of him.
Two things to consider there.
1 - I paid £30 for 30 months last year, and there's semi-regular offers of £1 for a month or £2 for 2 months, so it's definitely possible to do a lot better than £2 a month;
2 - As far as I'm aware, the arguments about live beating psn were a long while back (before sony's premium service), and tbh xbox live has gone downhill recently, in my opinion. Horrible "Metro" layout, bloody adverts everywhere, and a lack of decent games to actually play online (though that last point is definitely a personal opinion and one that would apply to playstation, too)