The Project III would be a perfect fit with the RIPPER. Although someday you might want to upgrade the cart and/or table for better sound. Still, it's a great match to get started in analog.
There is no Hagerman house sound. Sorry to tell you that. My electronics are not "voiced" in any way other than for transparency and openness. They are designed for crystal clear linearity with perfect transient response and dead-on equalization. No tone controls here, except by rolling tubes.
If you are looking for added euphonic earthiness or bloated bass or emphasized highs, then you'll have to shop elsewhere. On the other hand, don't expect anything cold and sterile, either.
The Sennheisers will work, but I'm not sure how loud they will be.
jh