Hard to say, especially since what deals they are going to have are unknown, however if each day they have $25 off of a game (Which is unlikely) you save $125, with the pack you save $316. So for games-to-price ratio the pack is obviously the best option. However you may not play all the games in the pack, so buying individually might be a better deal for you.
What I do is look at the pack, see what games I'm interested in, and add up what they'd cost individually. If it works out as less than the package price, easy decision. If its about equal, then some of the less interesting games may make it worth grabbing.