Must... not... insult... old... post... for... stupidity.... ARGH...
Foil is gay, and Sabre is not practical unless your on horse back. Epee is the way to go.
Foil is standard and function much in the same way as an epee, I believe the main difference between the two is where one can be stabbed for points. In addition, sabre isn't the horse back slashing weapon, it's basically a real rapier in that it has slashing potential in addition to stabbing potential, overall though, fencers are beginning to seem tired and overused.
Musket could have a stab with a shot at the end as a just or something of that sort.
additional ideas:
double axe (blade on either side of the hilt)
double flail (flail on either side of hilt)
triple flail (three flails on same side of hilt)
scimitar
falchion
jitte
pick
net
My final idea is similar to the Dungeons and Dragons soulknife, ability to make sword from mental power, ability to focus the shape of the sword (e.g. change from short sword to bastard sword or two swords) possibly ablility to throw sword, possibly ablitity to make a nova-ish effect with blade either shattering and swirling around or basically making multiple versions of the sword facing in different directions, move that makes next move unblockable.
Feel free to expand on any of these ideas or insult them as you wish/find appropriate.