I have a 21/15 Hoplite Thrower. But I'm about to respec with the new patch. Throwing Lance allure has worn off. But to encourage you... I had a blast using Throwing Lances. This is the first and only build I've had using a throwing weapon. Think you'll have a blast as well!
Strength: 21
Agility: 15
Hit points: 56
Power Strike: 7
Shield: 5
Athletics: 5
Power Throw: 7
Weapon Master: 5
Polearm: 93
Throwing: 101
I really loved this build. Was quite effective as well. My gear was a little different. I usually went with 3 Throwing Lances and an Elite Cav Shield. I was going for more of the Greek Hoplite (round shield), over the Roman look. Used the same chest armor. Never took a side-arm weapon, because I didn't have enough WPF to spread around with 5 WM. Plus the Throwing Lances were very effective in melee without the shield (when 4-directional attack was needed). But with 6 WM, you may have enough WPF to put points in 1H.
Personally, I'd look to take around 101 Throwing if it's possible for you. Always test with your armor. I'd put 75 points, test. Then 80, then 85. And so on. I think with my build, I needed between 90 - 95 WPF to be able to pick up Throwing Lances. So I went with 101 to give me a little room.
Think about putting 101 Throwing, 99 Polearm, & 56 to 1H. With the melee bonus you'll get:
One Handed: 67
Polearm: 101
Throwing: 101
Another viable weapon setup is to go with a set of Lances (3 ammo), a 1 slot shield, and a Spear (1 slot), and a side-arm sword. May be higher upkeep with all that gear. But this allows you to throw all 3 Lances. You get a better melee weapon in the Spear, and you still get a side-arm sword. Unfortunately, there's not really a gladius type weapon avaialbe. The Broad Sword has the proper shape/thicknesss, but is way too long. The Italian Falchion seems the perfect size, but doesn't have the tapered-point design of a gladius.
I've also went to battle a many a day with a War Spear, Buckler, & 2 Throwing Lances (now you can take 3). Weak against range, but the buckler is just fine in melee. War Spear is can be deadly.