I like the Gestalt idea...but I suggest Dwarven Fighter/ Artificer. Instant use out of any magic items found. High survivability. With just a couple of items, the character is a potent wizard *or* cleric substitute. Plus, the character has knowledges and skills that will make them great at the WLD...and Trap Sense.
Heavy armor, good weapons, any items use, Trap Sense, Dwarf stonecunning...where can you go wrong?