It is likely that many of your opponents will be using invisibility of some sort, so Blindfighting is a must. Iron Will and Lightning Reflexes are necessary also, as much of what you need are good saves.
I wouldn't invest too heavily in armor, as most of your serious threats that are AC based will be either touch, ranged touch, or flat-footed, so purchase normal armor that takes max advantage of your DEX and spend your armor cash on an amulet of nat prot. and a ring of prot (probably only +2 each with your cash cap, but it will apply ALWAYS).
As said before, Potions are your best friend. Heroism, Cat's Grace, Endurance and Wisdom are Key, as they will buff your saves. Haste will help all around. Potion of Flying will give you the necessary mobility. Resist Potions (Fire and Electricity being the most useful) will help some with AoE and DD spells, but are really a luxury, ie get everything else first. Potion of Nondetection and Invisibility used in combination might give you the time you need to get a good position and wait out a few opponents.
Cloak of Resistance, get it. Brooch of Shield Ditto. Sure Striking on your Weapon, you bet.
I made a fighter trying to see how I would do it, and I gave him a +1 Keen Sure Striking Falchion. With the Expertise, Improved Trip, Knockdown chain and Weap Spec and Improved Crit, I had this guy threatened a trip every time he hit and Criting on a 14 or better for double damage.
Hope these help.
Carl W. Rowe