I like the idea of shifting Parra to CF. I actually dealt for him in my Astros 'chise and I play him in CF, he's great there. Probably the best throwing arm in the game among CFers, and decent enough speed too.
If you want a slugging outfielder...I'd suggest these guys (a mix of high profile and under-the-radar targets):
Justin Maxwell (HOU), Chris Young (OAK), Seth Smith (OAK), Josh Willingham (MIN), Jeff Francouer (KC), Matt Joyce (TB), Justin Ruggiano (MIA), Giancarlo Stanton (MIA), Alfonso Soriano (CHC)
Those guys are mostly known for their power, and they should all be obtainable. Of this list I really like the idea of trading for Francouer and playing him in RF and Parra in CF. Francouer would be essentially free to acquire too (just take on salary). Ruggiano's not as powerful but he's the most versatile of the bunch. And Soriano is probably the best combo of power and low price.
Stanton and Chris Young would probably be the most "long-term" of the bunch.
Someone mentioned Mark Trumbo, but I don't like him for the D'Backs at all. With Goldy at 1B for the forseeable future, Trumbo would have 1B blocked and no DH available. So you'd have to play him in the OF where he'd no doubt hurt you. There are better options for an NL club.
Martin: Yes
Shields: No No No
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