A few questions about mobile recording (RME & MH & Hard drives)

in a couple of months i will have enough for a laptop and a firewire interface.
after quite a bit of obsessive research, it has come down to the metric halo MIO 2882--which i now favor as an option--and the rme fireface.
I favor the metric halo because it is bus powered. this is actually the only thing that tipped the scales in favor of the metric halo, as the fireface has better preamps (apparently the 2882's pre's get hissy with high gain.)
this brings me to my questions.
1) if i run my rig off of battery power, i will not be able to use an external firewire drive. would i get acceptable stability from tracking to a 7200rpm internal drive? i understand that tracking to the system drive is ill advised, but what else is there to do?
2)if it is ill advised to track to the internal hard drive, why shouldn't i just get the fireface and run everything from a power outlet? what use is having a bus powered interface when i can't track properly witout plugging my drive in anyway?
3)how many owners of the 2882 track off of the powerbooks battery, and what has been your experience with this?
Want Macbook Pro...badly   Mac OS X (10.4.5)  

Get anExpressCard/34 with a Firewire 800 input and run an external Fw800 drive off of that. (I assume that the ExpressCard isn't on the same bus as the FW400, but you might want to investigate that...) Before you get an external, do a few tests and record on the internal drive. See if the internal is adequate for your needs.
Also, be sure to upgrade your MPB to have a 7200 rpm drive, the standard drive is the 5400 rpm.
Concerning battery life... There isn't a lot of info on the new MBP battery life. In fact, you have to get to the specs page to get a mention of the battery info.
http://www.apple.com/macbookpro/whatsinside.html
I suggest doing a thorough search if this is a real concern. You can dim the screen and that dramicatically increases the battery life. I am not sure if the MPB have the same battery as the Powerbook, but for the old Powerbooks, you can purchase "tricked" out batteries that have a higher energy capacity.
good luck with your MPB.
Dual 1.8Ghz G5 PB G4 1Ghz LP7.1.1 Motu 896   Mac OS X (10.4.5)   Reaktor 5.1 Reason 3.0.4 Live 5.0.2 Battery 2.1.1 Recycle 2.1

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