Formatting a PC-formatted External Hard Drive to work in Mac OS

So I have a 300 gig external hard drive formatted for Windows XP with NTFS. I recently got a Macbook Pro and as it stands in Mac OS X the hard drive is read only. I can copy files from the hard drive to my Mac, but I can't edit files on the external HD or copy from my Mac to my external HD. This of course is a problem and so I need to reformat it to work in Mac OS. While I will not be using PCs anymore, if possible I would like for the external HD to be Mac and Windows compatible.
First things first I have to get all 300 gigs of files off the external HD in order to reformat it. This will be a pain but I have the means to do this. Once I get everything off, how and with what method should I reformat it to work in Mac? Should I use the HFS file system or MS-DOS? Also, what utility in Mac OS lets me reformat it. As I said, I probably won't be hooking up this external HD to Windows anytime soon, but if there is a way to format it in Mac to work with Windows, then fine.
So what exactly are my options here? I understand that I can format the hard drive in Mac OS with either MS-DOS or FAT32. I just don't know which is better/faster/more reliable in Mac OS, as I'm still a Mac newbie. I don't have files that are over 2 gigs as far as I remember, so I don't think that will be an issue. If it helps, it is mostly media files (videos, music). I've read up online about formatting a drive to work with Mac OS, but there's just so much info I'm getting confused. Thanks.

Thanks for the suggestions so far.
So from what people are saying, I can format the drive in Mac OS as FAT32 (aka MS-DOS) and it will work fine between the two operating systems.
I've been reading more though and it seems that FAT32 drives can not be larger than 130 gigs? Or is that just for partitions.
I have a 350 gig hard drive and I don't plan on having any partitions. Can I just format the drive as FAT32 in Mac OS and the whole 350 gigs will be available? There's so much conflicting info in articles I've been reading.
thanks

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