Travel insurance for long term?

does anyone have a travel insurance company they can reccomend?  I will be in Costa Rica for at least a year, going in and out.  But I would like some insurance in case somehting happens to me in Costa Rica.

we like world nomad - you can buy for months at a time, and extend it as well.
http://www.worldnomads.com/travel-insur … ountry=USA