Yep, both configurations have 30 seats. If they have the cargo mod, they can accomidate 1543 pounds of luggage in the hold, otherwise 1213 pounds.
The large bin Brasilias can accomodate two standard 22" roller bags, the small ones can accomodate one 22" Stealth bag if it's not bulging at all.
Under the seat infront of you you can easily fit a standard laptop case, or a standard pilot kit case, sideways under "B" seats, lengthwise under "C" seats or "A" seats. Sometimes you'll have to take off the seat cushion to fit the kit between the seats to get to the floor.
I only have a little experience fitting stuff in there.