You didn't give us a huge amount of information but here are some probably decent picks:
Level 4: Casque of Tactics (AV 1)
Level 4: +1 Acidic Weapon (Heavy Blade, Light Blade, Spear) (AV 1)
Level 4: +1 Dark Leaf Armor (Cloth, Leather, Hide) (PHB)
Level 5: Couter of Second Chances (AV 1)
Level...