If you have to wait until kunark to afford the FBSS but can get the mith2h now Maybe consider that, because you've now kind of got diminishing returns on that fbss with all the plat you had to farm without haste!
Mith 2h will take a warrior well into kunark for DPS to be totally fair, especially casually.
It is also a bad ass sword
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But I agree with Vex overall, if you can save up after just a couple of weeks between your group, get the FBSS!