Hi Voiding..
SAP releases enhancement packages for SAP ERP 6.0 on a regular basis. EHP 6 is the last enhancement package for ERP 6.0.
If you need functionality or performance issue and it is solve in perticular EHP level then you can go to t that perticular EHP level. Otherwise my openion is no need to go there.
SAP ERP 6.0 ECC Server consists of two different types of software components as below.:
- Application-related software components, such as SAP_APPL
- SAP NetWeaver-related software components, such as SAP_BASIS or SAP_ABA
After an update to EHP 6, selected software components of the application area have been updatedto a higher version, such as SAP_APPL 606, and NetWeaver 703.
EHP6 + ECC 6.0 can be install as a bundle when you want to install.
For further information see NOTE 1064635 this will give you a explanation.
linkhttp://service.sap.com/sp-stacks
regards
Priyan