I'm not too familiar with Darwin Barney. He seems to be good enough defensively to fill in wherever needed. Offensively he's high-contact low-power guy. His average was only .249 last year with an OBP on the wrong side of .300. Going forward, I see him hitting for a much higher average [.270?] because of his contact abilities, but .300 doesn't seem likely. He will probably bat 7th or 8th when he plays.
I'm a big fan of Reed Johnson. He's not good enough to be an everyday player (sorry) but he is a lefty masher and a solid defender. He should have usefullness, manning right field vs lefties. Masher may be a bit of an overstatement, he will not hit many homers against lefties but has been historically high average, high OBP vs southpaws. He could maybe even be a better lead-off man than Jeff Baker.