[LUNI] What's the best way to transfer a large amount of data between hard drives?

[skie at dragonsvalley.com]

Well, my OS drive has finally decided to die on me.  At first I thought it
was just general OS instability (I thought I over optimised Gentoo), but I
realized last night that it was the hard drive.  This morning, it knocked
like crazy and won't work at all now.  Oh well.  Anyway, I'm getting
offtopic already.

I'm looking at buying a new larger drive for my /home and using my current
/home drive as the / drive.  There's almost 120GB of data on this drive
that I'll need to transfer.  What's the best method of transfering this to
a new drive?  dd?  rsync?  mv?  I'm thinking that either dd or rsync, but
I've never really used either very much.  Any input on the pluses/minuses
of these is appreciated.  Or, if there's another tool you recommend, I'm
all ears.  Whatever utility is used, it'll have to be command line only.