Congratulations on the move! Brasilito is a great place – love the seafood restaurants on the beach.
Nick Hodges, from NCH Wealth, speaks at IL conferences about expat financial matters. He’s based in California. But you can contact him here: http://www.nchwealth.com
I’ve also seen this agency, operating in San Jose, US Tax International: http://www.ustaxinternational.com
Also, the U.S. embassy here has a big info page on taxes, although they do not offer assistance with filing taxes: http://costarica.usembassy.gov/tax_info.html