Typical weenie without Tithe runs 20 plains, only if they are very low on 3 cc creatures, and completely without 4 cc´s.
In your case u have 8 cc´s, and 4 Armageddons.
Even if u manage to Armageddon, remember permanents are easier to cast with mana available
Besides, do u care about pesky enchantments/artifacts at all ? That is also one of weenies strengths, dealing with enchantments/artifacts for a low amount of mana and in a good way - The instant Disenchant or the even better Seal of Cleansing. If i were gonna play Armageddon Weenie, id go for something like this-

The following things should be included, the rest is up to u
4 Soul Wardens
4 Mother of Runes
4 Soltari Priest
4 White Knight
2 Seal of Cleansing
3-4 Paladin en Vec

4 Tithe
4 Swords to Plowshares (the REAL strength of weenie, ask anyone and theyll agree)
4 Armageddon
4 Empyrial Armor - its ok
17 Plains

I play weenie myself. I play Scroll style, becoz Armageddon is a card i think most will counter, and some decks just dont care about total land destruction - When they cast Gush u might even hope for them to cast Daze, it can be that bad.
My Weenie anyway
Think its something like this - It might be - 1 en Vec and one more Seal, or - 1 Knight and one more Seal
4 Mother of Runes
4 Ramosian Sergeant
4 Steadfast Guard
4 Soltari Priest
4 White Knights
4 Longbow Archer
3 Paladin en Vec

3 Cursed Scroll
2 Seal of Cleansing
4 Swords to Plowshares
4 Crusade
4 Tithe
16 Plains