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Personally, I use ext3. Where I live (out of town, rural, in the country), power outages are a regular occurance. Ext3 recovers the journal on re-boot, and I'm good to go (a 6 year old computer with a 450 MHz cpu). If the need should ever arise that I need to revert to ext2, all the documentation I've read says it's more easily done from ext3 and any of the other journaled file systems.
As far as file size limits are concerned, I don't know what the limits are. My entire distro is, at present, just 7.8 gig. I don't have any problems with it.
Recent versions of ext3 have large file support. On the big file servers at work I routinely manipulate files that are over 100 GB in size and ext3 handles it well. A non journaling filesystem is slightly faster because there's no journal to maintain, but you'll regret using it the first time you have a power failure.
Here's an article about filesystem comparisons that should be of interest. My recommendation would be to use either ext3 or reiserfs, or whatever the default filesystem type is on your distro. As for me personally, I use reiserfs on all my boxes. It's the default for Slackware, and I figure that if Patrick makes it the default, then I should too. -- J.W.
You have two options: if you want a journaling filesystem go with ReiserFS, it's faster than ext3 for the most part.
However, if you're more interested in speed and don't care about journaling, go with ext2 because it is faster since it doesn't have to write the journal at every transaction.
FYI journaling is just a faster way to deal with a system crash after reboot, it doesn't provide, AFAIK, that much more stability.
On my Internet gateway system (at work) we have an array (non RAID) of SATA disk drives. The drive that holds the system and mysql databases and web pages and other mission-critical stuff like the proxy server and other binaries and sources is on a ReiserFS drive. The web proxy cache (the actual cached files) is on a dedicated ext2 disk -- it's slightly faster because it doesn't journal and if a few files in the cache get a little corrupted after a dirty shutdown, nobody really cares.