Since it's a low output level when using the phono stage that is your primary dissatisfaction, you should probably check with AVA about the phono sensitivity of your Omega Pat-5 vs. the integrated and other newer options before spending your money. I wouldn't expect to find a big difference there, but you never know. I use a 4.0mV cartridge with my OmegaStar PAT-5 with no sense of low output. A volume control position of between 9 and 10 o'clock is all I want, but my speakers are a bit more efficient than yours (though less than 3dB difference).
I strongly considered the integrated because a one-box solution would be a big help in my space-limited apartment, but in the end decided that I simply couldn't do without the control features of my OmegaStar PAT-5 (I get a lot of use out of the EPL and tone controls). To get effectually a one-box solution, I ordered a 240EX in a compact chassis and plan, when funds allow, to trade in my PAT-5 towards an OmegaStar EC to gain stackability, and thus free up a shelf.