Yeah there's a lot of options and things that can go right and wrong. I think the OP only wants a phone line that acts like POTS but we can still geek out a bit.
Having your own PBX on a low power device is tons of fun and you can build your own failover schemes. The no cost incoming is nice if you get a lot of calls but what's nice about voip.ms et al is that paying for every call can work out really cheap. $5/mth with some bells and whistles. I have more ways to contact me than I get actual calls. I still keep an old Nokia N800 as a house phone and it works fantastic. And the SIP enabled smart phone, and a cordless, etc....
to the OP, with a standards based SIP account you can do things like add SIP to your smart phone and never call long distance over your voice plan.