There's something weird about the ^P/^N menu - I always have trouble telling which possible completion is selected in the list, and I often end up picking the wrong one.
yeah, I should tweak it somehow. This is what the (otherwise amazing) inkpot theme looks like: http://imgur.com/TaUym - can you tell that the dark, bold entry is selected?
I don't know which entry is selected (because I don't know the color scheme) but those two items have very distinct colors and I would definitely be able to differentiate between them.
I think you should experiment with some other color scheme or try to tweak your existing scheme.