You do not have to stay on SQL 2000 just because you need DTS.
If you install SQL 2005 and download and install the DTS Designer component you have a fully functioning DTS environment in SQL 2005. DTS Designer is also supported in SQL 2008, so you can upgrade and keep your DTS.
If you install 64-bit SQL 2005, your DTS runs in WoW mode so it could be a bit slower than running natively on a 32-bit OS. On the other hand, 64-bit SQL 2005 on a box your size should significantly out-perform a 32-bit version, more than making up for any performance lag in DTS.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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Disclaimer: All information provided is a personal opinion that may not match reality.
Quote: "When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist." - Archbishop Hélder Câmara