A Note on Cross-Class Skills
I've done some experimenting and thought I'd lay out the details/usefulness of each cross-class skill, and a conclusion as to which ones I feel are most beneficial to include in the rotation:
Lv.4 Featherfoot, Pugilist
(Good for solo perhaps, but in most (party-based) situations, a waste of a slot. Evasion bonuses don't help you much in a party, you're a DPS, not a tank)
*Lv.8 Second Wind, Pugilist
(Good for solo purposes as well as helping out your healer when those pesky "unavoidable" attacks strike, or if you mess up and get hit by something you shouldn't have)
Lv.10 Haymaker, Pugilist
(Good for solo perhaps, but in most (party-based) situations, a waste of a slot. The fact you need to evade an attack to proc this ability makes it rarely used since you're a DPS, not a tank)
*Lv.12 Internal Release, Pugilist
(Self-buff to DPS, an absolute must-have)
Lv.42 Mantra, Pugilist
(Decent for party play, but in most situations you may find it unecessary. The buff duration is low, and at best it's offering a rather small bonus to healing aptitude. Chances are your healer is more than capable of managing your party's HP without the help of this buff. I'd recommend it for a party of 8 that are melee DPS heavy, but not one with several ranged DPS or for a party of 4)
*Lv.2 Feint, Lancer
(Good for solo and party based situations. It's basically Haymaker without the need to evade for a proc. It can be highly useful since slowing the mob help keeps you and/or your party alive, and it shares the GCD so it's always ready)
Lv.6 Keen Flurry, Lancer
(Good for solo perhaps, but in most (party-based) situations, a waste of a slot. Parry bonuses don't help you much in a party, you're a DPS, not a tank)
*Lv.22 Invigorate, Lancer
(Good for solo and party based situations. With Huton up you may notice that you really start to fly through your rotation, and may fall short of TP on occasion. This also helps when you're spamming Death Blossom to burn down several trash mobs)
*Lv.34 Blood for Blood, Lancer
(Self-buff to DPS, an absolute must-have)
*These are the 5 I've chosen, with swapping Second Wind for Mantra in those situations where it would benefit my melee-heavy party.