Loading Server 2000 on a GX280???

I am attempting to upgrade a soon-to-be purchased Optiplex GX280 as a backup to my PowerEdge 2500 Server 2000 server. I was hoping to create an XP/Server 2000 dual boot. Then when my old 2500 decides to blow a power supply or riser card, I can reboot the GX280 as the server, restore roughly 50GBs of data and a couple programs (Trend Micro Neat Suite, FileMaker 5.5, Veritas Backup Exec 8.6 & MIPS Accounting (which loads SQL)), and thus lessen the downtime while I wait for Dell to ship me my 2500 replacement parts. Has anyone attempted to do this? I have roughly 50 users saving and retrieving small to mid sized Word 2000 documents, while using the server for WEB access to a DSL line. I have roughly a 1/2 dozen people lightly using a couple FileMaker Pro 5.5 databases, 1 user using an older FoxPro-based Donor Perfect database (I think this database is small enough to fit on 4 floppies), and one user accessing a MIPS financial SQL database of approximately 250MBs in size. If I configure this, and Dell says it should work, does anyone have any idea as to how slow the disk access will be, even if I bump GX280 system RAM to 2GBs? Everyone says, try it and see what happens. But we're a small non-profit group, and I cannot get the added $320 in hardware upgrades approved with a "buy it and try it". Thanks in advance to anyone that can suggest anything or share feedback from similar setups.... Erik at netman8176@aol.com.