Goliath and Monkey Grip technically don't stack because they are both "one size larger than your current size." A Goliath is still a Medium creature. If you were to play a Goliath barbarian with the Mountain Rage ACF though, you could use Monkey Grip because now the Goliath has become Large and lost Powerful Build. Assuming you were using a greatsword, the goliath would normally have a large one which is 3d6, and going up to huge would be 4d6. That's only, on average, a +3.5 bonus to weapon damage for the price of -2 on attacks. On average that's worse than Power Attack's returns with a 2H weapon.
The Balanced property uses the 3.0 weapon size rules which means you'd have to update the enhancement to 3.5 weapons. Since it only works on one-handed weapons though, you'll likely have a problem because I expect you'll want to use the weapon 2-handed to get proper damage out of it through Strength and perhaps Power Attack. The only way you're going to do decent damage with a one-handed weapon is if you have extra damage dice (like Sneak Attack) or you're a Martial Adept from Tome of Battle and are using maneuvers.
In place of Balanced, which is a +2 enhancement, I'd recommend Collision from MiC page 31 instead. It's likewise a +2 enhancement, and it simply adds +5 to the weapon's damage. It's often better than getting a larger weapon.
If, in talking with your DM, you are able to use a Gargantuan weapon, and Balanced is ruled to allow simply using any weapon one size larger than you can normally wield, then it might be worthwhile. A Huge greatsword deals 4d6 damage, while a Gargantuan one deals 6d6, an average improvement of 7 points which is larger than Collision's 5.
Crusader (from Tome of Battle) works very well for tanking/controller/lockdown. Regarding its maneuvers, I recommend making some cards and just using those for the granted maneuver mechanic.
If you're not able to use Tome of Battle, then you'll likely go into some combo of fighter and perhaps barbarian, and maybe even Psychic Warrior.
The reason for fighter is because you're going to need feats to control things.
Knockback is a great feat in conjunction with
Shock Trooper.
Barbarian can get you some great stuff. There's the Mountain Rage ACF for Goliaths which makes you Large when you rage and grants a +6 strength boost instead of a normal rage's +4. The Lion Spirit Totem allows you to trade Fast Movement for the ability to Pounce (which is make a full attack on a charge). There's also the
Wolf Totem barbarian which gets Improved Trip for free in place of Uncanny Dodge. Improved Trip leads into
Knockdown which is definitely awesome.
Combine Knockback, Knockdown, and Shock Trooper, and you're a melee monster.
If you want to take advantage of reach (you do want to hit things and not let them hit you, right?) then you're going to need a reach weapon. A guisarme is probably the best martial reach weapon, and then you can wear armor spikes to shore up the adjacent squares to you. A spiked chain of course lets you attack at natural reach and extended reach with the same weapon and is regarded as one of the only exotic weapons worth the feat to use it.
Psychic Warrior was mentioned because it gets the Expansion power, which works on Goliaths (unlike Enlarge person, which works only humanoids and leaves Monstrous Humanoids like the Goliath out of luck). Lots of extra reach there which will allow you to control things. And it gets some fighter feats too, so you could still do the combo of Knockback, Knockdown, and Shock Trooper though it'd be later than straight fighter.
Can you give us specifics though? Do you know what kind of tank or controller you'd like to try? What books are available to you?
