Don't bother changing yet. (only do it when you are "comfortable" with the idea, and really know how to do it.
I've been using Ubuntu for 3 months now, and the NTFS system works fine, but it does have those "permissoins" issues and its not as robust when there's a powe-out... so I'm converting to Ext4 (I'm actaully in the middle of doing it today :) ... by the way, it is a DATA only drive.. Ubuntu / (root) and /home are on a seperate 300 GB drive.
The only issue (which isn't an issue if you know how) is needing to understand the mount entries for /etc/fstab and the mountpoints... (maybe there is a GUI tool for that, but I prefer to "get under the hood") ..so hold off doing it until you are confident about mouting devices permanently..
I've got it working now, and its a great learning experience (about mounts)... but! be sure you can do it before you try it out...
I also partiion the drive (1 TB) to allow 100 GB as an NTFS partition for "Windows only" stuff (a reminder of the bad-old days :). I've got 2 backup 1TB drives, and I would recommend that you HAVE A FULL AND COMPLETE BACKUP before you start!
So take your time.. don't rush into it.. and one day, down the track, you'll "just do it!" :)