There are a range of options available to you but they depend on how much bandwidth you want now, your possible future demands and your budget (Of cause!).
Bonded DSL is a great option and we can do this up to about 4 lines where the gain for the extra circuits starts to become out weighed by the over head of processing out of order packets.
EFM is like a fibre leased line but supplied over copper. It's kind of a bonded DSL, so distance dependent with speeds from 20Mb/s down to about 2Mb/s depending on distance. We would quote you a minimum guaranteed speed and a projected speed before ordering so you know what you will be getting. The downside to EFM is that you can only get what you are quoted, there is no upgrade path. If you later needed 20Mb/s on a circuit delivering you 5Mb/s you can't. The up side is that unlike bonded DSL, EFM comes with an SLA and unlimited, 1:1 contended, symmetric bandwidth (So the same speed in both directions) like a fibre leased line, so it's like a cheaper version without the expansion options.
Fibre leased lines are the Rolls Royce of connections and the most expensive but you get what you buy. You want 30Mb/s then that is what you get in both directions. Coupled with the ability to upgrade from 10Mb/s to 1000Mb/s you get ultimate flexibility but at a price! The only other downside is the lead time for installation as these circuits are very much bespoke to you so will be installed on your own, private fibre which takes time to plan and install.
We can deliver all these as managed services, so we supply the PSTN lines/ bearers and the hardware fully configured and all you have to do is plug it in and put your network on the LAN interface. We'll then monitor the connection once in service to ensure all is and remains well.
Please feel free to contact me if you want to have a chat about your options, I would be very happy to put some prices together for your options and discuss the pros and cons in more detail.