I am the harbinger of your financial doom. I just bought The Stanley Parable. It was only $8.99 at 40% off. Normally I am immune to Steam Sales, but this time I have been weak.
Today's deals are pretty good. They might actually be the best yet. This is the second last day of the sale as well, so if you're looking to pick something up now is the time.
I've already mentioned The Stanley Parable, which is awesome. Europa Universalis IV for $19.99 is a decent purchase — if it's as good as I've been told it is.
Tomb Raider is arguably one of the best 'AAA' games of the year and it's currently 80% off at $13.99. That's just ridiculous.
Oh and Brutal Legend is currently $1.99 on a flash sale. Wow.