I doubt you'll have a problem with using a USB stick on a fresh install, but if you want extra safety then burn all the drivers you need to a CD.
The absolute minimum drivers you need is for the NIC, or Wireless NIC. With that you can get to the internet and get everything else you need.
What are you installing on it, XP, Vista, Windows 7?
In my experience Driver support on installs has got better as Windows has gone on so you may find that you don't need the NIC drivers, but it's always wise to be prepared.
HOWEVER, also in my experience the drivers Microsoft make available may work, but I find they just don't work as well as the drivers from the Manufacturer, so I'd always install Dells if available.
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I've had a look at Dells driver support for the M60, and it looks like they only go up to Windows XP.
You can try installing Vista or Win7, but if anything doesn't automatically find drivers you may have an uphill struggle to find working drivers.