Our test also indicates that your line currently supports a fibre technology with an estimated WBC FTTC Broadband where consumers have received downstream line speed of 36Mbps and upstream line speed of 7.8Mbps.
Would BT be the best for unlimited usage? Works out at over £40 a month tho doesn't it? Compared to £25.50 for Sky
So effectively you'll be paying £1 per 1Mbps increase in d/l speed
I believe most, if not all, of the current FTTC offerings have traffic shaping and/or capped usage.
Yes, Infinity is unlimited and is a good choice as long as you're not a heavy torrent user. I've read that torrents are throttled right down to 20K/sec during peak hours, but it goes to full speed when off peak (though some have said it's slow 24/7).
At least with Sky it's fully unlimited with no traffic management? Plus the main thing is that you are happy with them.
You'll be stuck for 18 months with BT/Talk Talk/Plusnet, though their monthly charge is cheaper than the guys that offer 12 month contracts.
I have ordered Infinity myself and install will be next Friday. My current speed is 4.5Mb with o2, and should get 35Mb after Friday - plus it works out to just over £5 more per month (BT's current offer of 3 months free, and I get £50 back with Topcashback).
If I was in your position, I'd stick with Sky. It's cheap, truly unlimited, you know what you're getting. Maybe you could wait to see what kind of deal Sky would offer when they do FTTC.