It wasn't really in support of an album. More so a "we haven't been here in 2 yrs so we'll do a mini tour" type thing. It was only 2 days before New Years but, yes, it was 2004. Their new album wasn't released until April of this year so the full US tour in May/June was in support of that.
Personally, I think Praise the Fallen is the best CD to start with. That's their 2nd release. Their first album, Advance & Follow, is impossible to find as it was an extremely limited press so you might as well download that. However, all of them are worth picking up. Empires, Matter+Form, Futureperfect, or the Pastperfect DVD.
I would have caught them in Hartford the next day but I work full time and it was too short notice of cancellation to make plans to drive out & back on a work night.