Sun, or Linux 2.4.x As An NFS Server?

Quixote asks: "Time was, that the only choice for a stable, interoperable NFS server was a Sun box. Now, things seem to be changing. Linux Kernel 2.4.2 is out, and with this come more choices. If I'm putting together a central NFS fileserver to serve a moderate amount of space (say 200GB) to a mainly Sun/Solaris clientele; should I go with a Sun box with a A1000 h/w RAID (at 3x-5x the cost of the other choice), or should I look at Linux with kernel 2.4.x + a journalling filesystem like ReiserFS/XFS/JFS, built on top of a dual-processor P-III with 2GB memory, a Mylex RAID controller and a Gbit NIC?" Are the issues which were raised in last discussion on NFS and Free OSes still a concern? Are there any Linux 2.4 NFS boxes out in production anywhere, and if so, how have they been holding up?