Dragonfire Adept help [3.5]

[SilverLeaf167]

I'm building a Dragonfire Adept for a 7th-level campaign, and would like some help with him. The general idea of the build is using Draconic Flight to stay away from melee range while using the breath weapon to attack opponents on the ground. I would like some recommendations on items and feats to optimize this strategy and to pump up the save DC of the breath weapon. Also, what invocations/breath effects should I take?

Here's the basic info:
Strongheart Halfling, Dragonfire Adept 7
Abilities: Str 8, Dex 16, Con 19, Int 10, Wis 8, Cha 10
Feats: Ability Focus: Breath Weapon (flaw), Entangling Exhalation (racial bonus), Improved Initiative (lv 1), Dragontouched (DFA bonus), Draconic Aura: Energy (lv 3), Flyby Attack (lv 6)
Invocations: Endure Exposure, Magic Insight, Draconic Flight (Breath Effects: Frost and Slow)
We're allowed to have one magic item costing about 20,000 gp to start with.

I'm using invocations for utility and buffing, so I don't really need Charisma to raise the save DCs. The first feat I would want to swap out is Improved Initiative, and I assume that's the one you'll recommend anyway.