It really depends on what you want, what you are willing to pay, and what technologies are available.
I have friends who would LOVE to have 5Mb; until recently they only got ~240Kb, but after a local infrastructure upgrade, they now scale the heights of 1Mb.
You dont say where in the world you are, but there are much faster ways of connecting for about 90% of the Western World, although some of the more remote areas would have to pay a lot to get there.
Possible options include cable, hybrid fibre, full fibre, area wifi networks and 4G.