Most powerful build IMO. This build is powerful in the sense it kicks a*se all the way through the game and is always far ahead of enemies and you don't even have to be heavily into leveling. I blew up most of the mines in the game and still 2 hitted the bosses...
JEDI GUARDIAN -> LIGHTSIDE LIGHTSABER MASTER
Equipment --> anything that boosts STR and/or DEX
Weapon --> standard lightsaber (add strength boosters to lightsaber or crit hits)
Force Power --> Force Enlightenment = level 3 speed, barrier and valor
(with one quick cast you will have a warrier resistant to damage with raised stats and +3 attacks per round)
Feats --> max dualing, first 6 lightsaber specialisation points and toughness
FLURRY is the only attack you will ever use
Now by the time you reach the end of the game if you have cast enlightenment, not only do you seem invincible, a standard attack will kill sith guards and two flurry's will kill ANY boss (except Kreia's lightsabers, which still wont hurt you much but they take an extra flurry or two). I had to just enguage in standard attacks to make the final battles seem like a struggle.
Master flurry has no penalties and adds an extra attack. You will hit almost every single time so an extra attack will kill ANYTHING anyway so critical strike (which relies on chance) and deathblow (doesn't equal an extra attack, i'm sorry)
Going darkside seems quite pointless when being a melee master because it is quicker to kill things in a single attack and you have other party members around like Kreia who are specialised in Zapping things with Storm.
WHY STANDARD SABER?
None of the enemies ever have enough HP to survive more than one flurry. What the heck is the point on getting the unneeded damage bonuses from double sabers or staff when you spend the game trying to put in points to cancel the penalties rather than go single blade where you are powerful from the word go and you fight with MUCH bigger bonuses (you will never miss). Plus i feel more like a Jedi when i have my sword and nothing else. If enemies had more HP and the level cap was reachable, DEFINATELY double sabers or staff for a weapons specialist/marauder. However, for this game they are unneccessary and you will spend most of the game making up for their flaws (however double sabers you can get double the crystals = more stength points to raise your chance to hit)