A guildie told me that req 11 was 100K + 20 ectos. Just passing that along. That's for a weapon with dubious mods (20% chance swordsmanship and not much else).
I'd try for 100K flat price for yours, but 75-80K might be more realistic.
i agree it will probably bring between 100k - 100k +10-12 ectos maybe a bit more...put it up for sale in High End and start at 100k and see where it goes...don't give a B/O unless you search for other Req 13 elemental sword sales...