Based on those spec version 4.3.7 is the more suitable for that setup as 5.0 uses JAVA 1.7 and Tomcat 6.0:
Bear in mind that Confluence 4.3.7 reached it's EOL so to get support from atlassian you will need to use at least Confluence 5.2 version, below goes the support platform page for that version:
Hope it helps.
I am using a shared tomcat. I have access only to public_html (kind of webapps) folder. I cannot installed both tomcat and JDK. I thought of installing war version but i guess i have to edit tomcat configurations, which i cannot do unless i have a dedicated tomcat. I don't mind paying for cloud but i need my domain name as URL but If I am correct confluence doesn't support domain names in cloud. Let me stick with the program which i am already using.
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