As for what to get w/ Parker.. a few things not mentioned yet:
Johan: Johan's pretty much mandatory. He's phenomenal, and he's a bargain at 7ss. At 6ss for Outcasts, he's ridiculously good.
Big Jake: A great scheme runner, card-engine, and surprise attack to swing dicey situations on Turn 5. Great for certain take-and-hold strategies, too.
Sue: Just a great big bag of wonderful abilities.
As a bonus, they all fit Parker's aesthetic pretty well, too.