Choose an Elf. Wield an elven thinblade and an Elven longblade, if your DM will allow it. 1d6 18/x2, 1d8 18/x2 - count as rapiers for feats - kind of OP, but could be discussed with DM to just take a feat representing your special training with said weapons to be able to use one set of feats for them. But even then it's almost an exploit of some patched together rules.