Depending on the PC, the setting and campaign expectations (what kind of foes you expect to fight a lot), you might also look into special materials (Cold Iron, etc.) for your masterwork stuff.
Some options: I'd say a +1 Cloak of Resistance (1,000 gp), but you won't have much need of it after 2nd level. Perhaps a Potion of Invisiblity (300 gp) for when you get in a tight spot, a few flasks of Alchemist's Fire, some Tanglefoot bags, a Thunderstone, some silk rope, perhaps a handful of other things.