Will you need the additional drive capacity on a regular basis: will you regularly be away from your normal work locations, doing stuff that would require more than the 160GB of disk space?
If not, instead of going with the slower 250GB at this point, you could add an external FW drive. You'll need one (or more) anyway. You could get a more portable external for travel.
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"Other World Computing (OWC) announced today the highest capacity 7200RPM portable, bus-powered storage solution on the market - the Mercury On-The-Go 200GB portable hard drive... The Mercury On-The-Go is blazing fast -- up to 50% faster than other (notebook) 7200RPM drives...
In addition to the 200GB 7200RPM drive, OWC now offers a 250GB 5400RPM Mercury On-The-Go portable solution available with FireWire 800/400/USB 2.0 and eSATA + USB 2.0 ports.
Both drives are available immediately through OWC and other retailers. Includes a carrying case, FireWire 400/800 cables, USB cable, Prosoft DataRescue III for OS X and NovaStor NovaBackup for Windows. All Mercury-On-The-Go models are covered by a one-year warranty and are compatible with Apple OS Versions 8.5 through 9.2.x; Apple OS X 10.0.3 and higher (including OS X 10.4.x); and Microsoft Windows 98SE, ME, 2000, XP.The OWC Mercury On-The-Go 200GB 7200RPM Portable Drive is priced at $359.99 and the Mercury On-The-Go 250GB 5400RPM Portable Drive is $319.99. For more information, see: [
eshop.macsales.com];