Bitcoin mining requires high-efficiency ASIC's (with 100's of GB or even ~TB) to get anything decent (In my opinion), So mining popular currencies restricted to GPU/CPU "if you have these" or even mining any alt-currency might prove to be more profitable IMO.
It's hard to be profitable while mining even for the GPU/CPU-only coins though, because most of the hashpower comes from guys who have optimized their computers to mine those, and also botnets.