According to Luftwaffe Colors, Volume One Section 2 `Jagdwaffe-The Spanish Civil War' by Eric Mombeek with J. Richard Smith & Eddie J. Creek. ISBN 0-9526867-6-7, It looks as though they were (This based on leafing through the pages)
Bf-109B-1
Bf-109B-2
Bf-109C-1
Bf-109D-1
Bf-109E-1
Bf-109E-3
OF course, the reason they went through so many variants was to `combat test' them as they developed them. They also have good information in that book on the He-112s in the Spanish Civil War.
P.S.-The series is the Classic Colors at this site:
http://www.classic-books.co.uk/ Their Books on the Me-262 are the best I have ever seen.
[This message has been edited by Sundog (edited 05-25-2000).]