Ah, your still waiting, well, try it out, see your temperature and either swap out your side fan with one with higher rpm's. I wouldn't remove it though, when the airflow can't escape the back it goes out the side.
an after thought on your 120's, you can have them spin higher and move more air over them. Yeah, the hard drives impede some of the flow, but that doesn't necessarily make it a bad thing, it's all about moving air through your case and keeping things cool.
Everything else aside, jorsoft has the right idea, replace the old fans, those are roughly 5 or 10 bucks. try some different things.
or, you could always try watercooling