Given the rapidly changing nature of the ADSL market, a 12-month plan is probably a sensible choice, which makes TPG the standout in this list (assuming you can get the unlimited option in your area). Netbay’s plans have even shorter contracts, but the low speed on offer means that in practice you’d be better off with a high-limit plan that shapes you; the same applies to Comcen and Supernerd.
Other alternatives might also suit you better. Recently, we’ve seen a number of providers (namely iiNet, iPrimus and TPG) offer plans with a one-terabyte per month limit. That’s not unlimited, but it is more than most people are likely to use in a month.
For details of the individual plans, hit the provider web sites:
Angus has been writing professionally about technology since 1994 and breaking it for even longer. He is based in Sydney but spends a frankly unhealthy portion of his life on the road, tracking down the latest stories. In 2011, he won the IT Journo Award For Best Consumer Technology Journalist and Consensus IT Writers Award for Best Technical Writer for his work on Lifehacker; about time too.