You can install a Firewire express card on your new laptop.
I've worked like this for a year - there are a couple of problems:
The express card can easily move in the slot and get disconnected.
Also you must run one power cable to your laptop, and another power cable to the adapter - this is extremely annoying and cumbersome to set up every time and maintain during work.
I bought a Macbook Pro only for the built in powered Firewire ports - and it's worth it, even though I understand the OS only enough to copy my files out of there.
Note that FW400 keeps the connector in much better than FW800 - so if you buy an adapter or a Mac then I would get one with a 400 - even if it is slower, keeping the cable plugged in is more important.