I'm not sure what your standards are for "best". Is there a dominant preference on video or audio or are both equally important? Some pre-pros will have better video options and even 4k scaling.
My personal preference is the Anthem pre-pros. The audio is fantastic and their room correction—ARC—is top notch. Video processing is incredibly granular and you can fine-tune several elements. The 3D models sport 4 HDMI 1.4 ports and 4 HDMI 1.3c ports.
I'd then recommend you look at the Integra and Marantz pre-pros with Audyssey. The Integra models come with ISF calibration and day and night settings for each HDMI port. the Marantz pre-pros have been getting fantastic reviews and Michael Fremmer made the Marantz his choice. You can get the Integra, Marantz, and Anthem 50v3D in the 1k-3k range. I don't know what your Onkyo model is and what you are finding limiting in the Onkyo.
I have not owned Emotiva products so I can't speak to how their pre-pros are.
I'd be curious what specifically you are not happy with and that may help in recommending a product that suits your tastes best.
My personal preference is the Anthem pre-pros. The audio is fantastic and their room correction—ARC—is top notch. Video processing is incredibly granular and you can fine-tune several elements. The 3D models sport 4 HDMI 1.4 ports and 4 HDMI 1.3c ports.
I'd then recommend you look at the Integra and Marantz pre-pros with Audyssey. The Integra models come with ISF calibration and day and night settings for each HDMI port. the Marantz pre-pros have been getting fantastic reviews and Michael Fremmer made the Marantz his choice. You can get the Integra, Marantz, and Anthem 50v3D in the 1k-3k range. I don't know what your Onkyo model is and what you are finding limiting in the Onkyo.
I have not owned Emotiva products so I can't speak to how their pre-pros are.
I'd be curious what specifically you are not happy with and that may help in recommending a product that suits your tastes best.