The current zip in the install area is 6.5.5; if you've just spent $199 then you need to go and update; 6.5 versions prior to 6.5.5 have vast security issues and you shouldn't just assume you will be safe (as it's easy enough to use Google to turn up sites running the 6.5.x releases).. honestly, i'd say that it's not WORTH installing 6.5.x unless you are using it to migrate to .t7 or will be operating 6.5.5
