Trying to make a completely DEX based character. (Bard, if it matters.)
Finesse allows DEX to attack rolls with light weapons, certain other weapons, notably the rapier and whip.
Slashing Grace allows DEX to damage with light weapons, and one handed slashing weapons. Could take Fencing Grace for Rapier, but...
Piranha Strike is basically Power Attack for light weapons. (Not rapiers or whips.)
So really to get the most out of these feats is to use a light, slashing weapon? (in the case of the bard, a dagger or a sickle.)
IS this correct? No other way around it?
Wakizashis are the best light weapon in the game for crit-fishers (unless you also need to throw said-same, in which case you settle for ordinary daggers).
Normally you'd buy an opalescent white pyramid ioun stone for martial proficiency...but that doesn't help bards, who lack martial proficiencies.
-- All the more reason I'd don't mind tossing a multiclass dip at bards. Swashbuckler or paladin, for instance, dovetail nicely.
1. (Any martial class, with a preference toward either urban-rager, or Yojimbo samurai.)
2. (rest Bard, unless 1. Paladin, then you'll pick up one more level of that.)