What flavor of server 2003?

I went to the Update Catalog
(http://v4.windowsupdate.microsoft.co...en/default.asp) selected:
"Find updates for Microsoft Windows operating systems" and it wants to know
what flavor of Server 2003 I have (until now I had no clue there were so
many to choose from). Bear with me:

- I installed the Enterprise edition, then SP1 for Server 2003;
- The Start->Control Panal->System says I have Enterprise;
- The cmd window just says that I have: Microsoft Windows [Version 5.2.3790]
- winver says: version 5.2 (Build 3790.srv03.sp1.rtm.050324-1447:Service
Pack 1)

Is there an easy way to determine which download I should choose? ( INFO: I
do not have access to the net with the server box and at this time only
desire to update it, not anything else).

TIA,
Markus