Just out of curiosity, at which point in the game would you guys suggest I do the Bring Down the Sky mission?
Right now, I'm off to complete Garrus and Wrex's loyalty missions (I know they're not actually loyalty missions, but it's clearly where the idea came from).
Also, found a slight beneficial bug last night. I'd peacefully sorted out things with Helena Blake, and was reconnoitring her HQ, when I came across a decryption point. I saved before trying it, and failed the first attempt. As I reloaded... there was an explosion, a scream, and I got XP/money (flashed up on screen too quick to tell which). After I left, all the mercs will still there, and I wasn't treated as hostile.