Just as Dead Space2 is launched today, three sets of downloadable content have surfaced on the Xbox LIVE Marketplace. They cost 400 MS points each and based on their description, seem to offer a variety of upgrades, but they are not very clear on what you’re getting.
Go for them if you will, but I think some (or all) of these upgrades can be unlocked or obtained naturally as you play the game. This seems to be an alternative to those who wants fast access to content and wouldn’t mind forking out cash for them.