I've just swapped to BT infinity option 2 from an Aquiss FTTC Business package and the only thing I had to pay on top of the monthly costs is £6 for delivery of the Home Hub.
When I changed to them though I did also pay for 12 months line rental upfront (Line Rental Saver) which was another nice saving on top of what I saved moving from Aquiss to BT but you don't have to pay that if you don't want to pay line rental upfront.
Was using a Cisco E3000 for my router previously with Aquiss but have been very impressed with the home hub so far so the E3000 is going on eBay so a bit more money back there too.
I hadn't used BT as an ISP for at least a decade so was a bit nervous moving back to them but once I got past the farce of them not knowing if I needed an engineer visit or not the connection has been great. Usenet downloads don't run at full speed during peak hours but then they never did with Aquiss and I haven't had any really slow speeds yet, slowest I have experienced is about 20Mbps. Outside of peak hours Usenet speeds have been great, 40Mbps.