Okay, wish list. Mmmmm, it's like shopping without having to spend any money . . . whee! But on the downside, you don't get to walk out of the store secure in the knowledge that it is yours. Alas.
1) Mithril Fullplate . . . this more than anything else that follows. Doesn't even need to be magical. If I had started with full wealth and not had spending restrictions / been worried about the guy who steals your good stuff when you arrive, I would have gladly blown more than half my starting wealth on this.
. . . can you guys tell I really hate sleep armor rules? Mithril armor + endurance = I live in the suit
2) hmmm, in the spirit of something more interesting and unique, a sword capable of simulating the effect (# of times per day kind of thing) of the "Whirling Blade" spell from the Complete Arcane would be neat, but I don't know if you have the book. Really, this is more of a "cool" than an "essential". It's just I'm trying to find something more creative than the rest of my list.
3-infinity) Your old standards.
Stat boost items: Con, Str, Dex in that order of importance. Dex only if #1 above is granted.
Armor class enhancers: Natural armor/ Deflection. whee.
Plusses. increased armor and weapon plusses. Original, no?
infinity+1) Not specific items for any stockpile now, just general notes about my wishes for Tristan's mechanical future. I know you didn't ask for this, but I figure good DM - player communications are essential. I think we have enough characters capable in melee combat to specialize (heck, everyone but Xerxes

). Baja is our 'go out there and thwack people' warrior, I see Tristan as more of a 'stay here and make sure we don't get thwacked' kind of fighter. Thus, items/feats/PrCs/whatever that increase his defensive ability and also important his ability to protect others are all good and important to him.