Like a lot of others right now I'm debating between a previous gen MBP or a new one. The lack of firewire 400 is a bummer (I have a lot of firewire devices that i use often) - but then I saw this. I know it's an obvious solution to some of you, but to be honest I didn't realize i could add 2 Firewire ports to my new MBP for $40. Pretty cool.
http://eshop.macsales.com/item/Other World Computing/EXPC342F1U/
http://eshop.macsales.com/item/Other World Computing/EXPC342F1U/