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That depends on what you want or need to do with it. &nbsp;It appears as if you could actually use the free Express version. &nbsp;However, it has many limitations. &nbsp;How much RAM you have and if you need features such as clustering would determine which edition to get. &nbsp;We ended up buying Standard Edition for our severs. &nbsp;I used this chart here: <a href="http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx" rel="ugc nofollow">http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx</a>
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That depends on what you want or need to do with it.  It appears as if you could actually use the free Express version.  However, it has many limitations.  How much RAM you have and if you need features such as clustering would determine which edition to get.  We ended up buying Standard Edition for our severs.  I used this chart here: http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx [http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx]

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I looked at that chart. &nbsp;My guess was workgroup or standard. <br />
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Problem with express is the 1 gig limit on memory. &nbsp;The system has 4 gig. &nbsp;There will be no clustering. 
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I looked at that chart.  My guess was workgroup or standard.

Problem with express is the 1 gig limit on memory.  The system has 4 gig.  There will be no clustering.

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Now where do I find info on an upgrade from 2000 to 2005? &nbsp;Specifically, the best price.
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Now where do I find info on an upgrade from 2000 to 2005?  Specifically, the best price.

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I will have multiple domains on a Windows 2003 Standard system with 1 cpu. <br />
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Which version of Sql Server 2005 should i use? &nbsp;And this will be an upgrade from Sql Server 2000. <br />
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I will have multiple domains on a Windows 2003 Standard system with 1 cpu. 

Which version of Sql Server 2005 should i use?  And this will be an upgrade from Sql Server 2000. 



which version of sql server 2005 for a single cpu Windows 2003 server

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.