Thanks for the feedback, guys. Like I said, I looked at Pena's career numbers and felt there was a strong chance that last year was an anomaly. Still, I gave up a couple of players that I could afford to lose (the 2 for 1 also allowed me to add another pitching option instead of essentially wasting another roster spot on a bench position player).
I knew I was risking getting a player that may not improve on his .220 AVG and 200 K pace, but felt it was worth the chance. At the very least, he's hitting in the middle of a pretty good lineup so I'm keeping my fingers crossed that some good will come of out this trade.
I just hope that Pena ends up being a better option than someone like Adam LaRoche, who I could have plucked off the waiver wire.