Thanks for getting back. More details.
I am helping as a volunteer with a non-profit organization. We have 3 Dell servers which have been donated over time.
1. Dell PE 1400 with Dual P3 1.4Ghz, 1GB Memory, CERC ATA100/4ch Hardware RAID 1 2 Drives 80GB for OS and Backup and 2 Drives 250GB for File storage for users
2. Dell PE 1800 Xeon 3.0 GHz HyperThread, 3GB Memory, CERC SATA /6ch with 6 drives 80GB RAID 1 to create 3 Drives. Mail Server and some room for SOme file storage
3. Dell PE 1850 Xeon 3.0 GHz Hyper 1GB M Ultra SCSI Drives RAID 1 37GB for OS and some monitoring applications and webserver
I would like to retire Dell 1 and move the File system.
Option 1 on to Dell 2 using existing RAID cARD and replacing 2 x 80GB with 750GB dives (Card cannot support more than that)
Option 2 on Dell 3 using a eSATA card and eSATA Mirrored external drive with 1TB capacity
Option 3 Standalone NAS Drive with 1TB capacity
Budget is limited to about $300 but could be more if promise of performance increase
Please recommend any brands of Hardware as well.