  We revisit the isovector pseudoscalar sum rule determination of m_u+m_d,
using families of finite energy sum rules known to be very accurately satisfied
in the isovector vector channel. The sum rule constraints are sufficiently
strong to allow a determination of both m_u+m_d and the excited resonance decay
constants. The corresponding Borel transformed sum rules are also very well
satisfied, providing a non-trivial consistency check on the treatment of direct
instanton contributions. We obtain [m_u+m_d](2 GeV)=7.8\pm 1.1 MeV (in the MS
bar scheme), only marginally compatible with the most recent sum rule
determinations, but in good agreement with recent unquenched lattice
extractions.
