In my experience, I would use a power hitter in that park only if there are at least 2 power parks in division, or if the league has a majority of power parks throughout. In a 12-team league you will spend only 6 (and sometimes 3) games at each out-of-division opposing park, so you don't want to overthink what do do about them as you dilute the advantage you will have for 81 games at home.
I like to play this park pretty straight, ignore power, and go exclusively with lefties who hit doubles and triples, e.g.
http://365.strat-o-matic.com/team/1455253That said, your suggestions are good ones. Musial might be my pick because of durability and his strength against lefties. I also like Turkey Stearnes here. For a little less dough George Selkirk's $6.76m.