I prefer buckets for primary, and they are usually at least 50% cheaper than a glass or PET plastic carboy.
I save the carboy for secondary, and in a pinch you can just primary 3-4 weeks, skip secondary, and just bottle from there.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10