File sharing – Moving away from an Apple raid to intel xserve

Hey Guys, I'd like to get some opinions for a file sharing setup based on what i already have setup. My current File sharing Machine Spec is:  A PPC G5 xserve - Running 10.5 server - connected to Apple RAID box  which is missing SN so i cant find out the exact model or how old it is. The Apple Raid is configured as Raid 5 and serves a 935GB primary file sharing volume to around 55 Mac and PC users ( i think the data is striped across 5 drives with an extra drive redundancy ) i have additional file sharing volumes setup in the xserve drive bays. In total i have around 1.6TB of data setup with raid and ADM's included. Ideally i'd like to purchase an intel xserve: get rid of the Apple raid box and transfer my data onto 2 x 2TB apple drive modules. i'm just a lil weary of possible performance issues of using a single 2TB ADM as my primary file-sharing volume... especially since i have a 50+ users... any opinions and thoughts would be super appreciated. domo arigato