2talk go free + local number would be ideal plan for me at home, we barely ever use the land line apart from family calling us on the local number occasionally.
I could see why they might not allow a local number on the go free plan, if they do allow it I could get away with $7/month (2talk Go Free + local number) instead of $22/month (2talk 500 + local number) for a "landline" at home which finally makes naked DSL much more attractive than pots + adsl.
I am on the telstra clear Internet only plan, and have been using 2talk exclusively for the last few months and it has been working great once I got a minor configuration problem sorted with my Linksys PAP2.
On any of the plans you can get an extra local number for $7/month. You can either get an existing one ported over (for around $20 from memory) or they can just assign you a new one.
How far away from the exchange are you? Have you canceled the standard land line? Personally I feel that naked DSL is the only way to get "cheap" Phone/internet combination.
I'm still shy of going naked dsl/2talk. Might would help if I knew someone else in my region.
I am actually on Telstra cable, so it is a slightly different issue. I did however try out 2talk for a few months beforehand, just using the free package and found that it works well. I do know other people who use 2talk using the naked dsl and they report that it works fine with no issues. What region are you in? I am in Christchurch and am happy to help out if you are in the region.