What to do with old spikes

[miakaye]

Just picked up this phal in Kroger this morning for five bucks. I've seen different opinions on whether to cut old flower spikes. What do y'all say? Should I cut them, and if so, where and when? I assume I shouldn't even touch them until after they're completely brown (one is almost 100% done, the other is still green).
By the way, I named this one Gomez. That little lady next to him, who's just about to bloom, is Morticia. She was also a special deal from Kroger (last August).