Way too much overhead IMHO.
With Hans Reiser in jail and his company Namesys gone reiserfs is not an option. There is just no upgrade path to reiser4 and the ownership is up in the air.
Ext3 is pretty much the standard filesystem for all Linux distributions these days. It combines good performance with good reliability and wide support. It also provides an easy upgrade path to Ext4.
In all my years as a Linux admin Ext3 has never once burned me, no matter what I threw at it. I would recommend using it for just about any workload, even for GroupWise.