I've purchased for myself a new gaming PC, and with it, I have secured Skyrim. I'm currently downloading the base game, and while that completes I want to ask; how large are Dawnguard and Dragonborn in size? My computer is not in any danger of running out of space (450gb space in my second hard drive) but I am worried about download times. Skyrim is going to last into the night, so I'm not concerned here. The Steam store page contains no info, and I'm not sure it will for DB until it goes live tomorrow.

EDIT: I'm not getting Hearthfire because I'm happy with the housing system as-is. Houses are just places for me to dispose of loot.

Dawnguard is about 600MB and Dragonborn is about 800MB. Well, on 360 anyway. But I reckon those are the same for PC as well.