What other RDBMS should my open source Java persistence library support [closed]

Question

I'm releasing a new version of jOOQ, a Java persistence library built on top of JDBC. Currently, I support these seven RDBMS:

• Oracle
• MySQL
• Postgres
• H2
• HSQLDB
• DB2
• SQLite (experimental)

With jOOQ I want to provide both broad and robust RDBMS support. This means I have to be quite selective in order to provide robustness with my integration tests. At the same time, I have to meet end user needs supporting important databases. I expect my end users to heavily rely on their databases. jOOQ is not an OR-mapper. Au contraire, jOOQ embraces vendor-specific features such as stored procedures, so the underlying database really matters to me.

In the next release, I want to add more RDBMS support. For example:

• MS SQL
• Derby

What would you suggest, and why? Please explain based on objective grounds and cite your references.

UPDATE:

The following RDBMS are now supported. Thanks again for feedback

• CUBRID
• Derby
• Ingres
• SQL Server
• Sybase (both SQL Anywhere and ASE)

Answer 1

With Ring Bearer's suggestion of sybase, and your listing of MS SQL and Derby, the only big ones left are Ingres and Firebird.

IBM also has a second database, Informix, but I know absolutely nothing about it besides the name :)

Answer 2

Sybase - why? a lot of systems still run sybase; especially in Healthcare domain. Sybase is industry class and feature rich. +1 for the project. I went through the site and I am impressed.