Yeah, the Titan should have been built from the start with twice the memory. I'm satisfied with 6.5 for daily use, this is my work phone. Memory on the Titan must be managed by settings, plugin, task manager and theme selection. 6.5 can be run successfully, you just need to plan ahead.
BTW, I tried that test. I don't use Opera so I opened PIE, Skyfire, Pandora, Palringo, Messaging and GPS WeatherRadar and have 4.5 MB free with Windows default (Titanium) running.