EdWilson, on 10 May 2013 – 07:38 AM, said:

In terms of what you can see, a telescope needs an aperture of about 1.4x that of an equivalent quality binocular to show you as much. Your Celestron 15×70 has an effective aperture of about 63mm (it is stopped down internally), so a telescope with a true aperture of approximately 90mm should show you as much.

Whether you like the monocular view as much as the binocular one is a matter of personal taste: only you can know that. If you want to use a binoviewer with your telescope to reintroduce the binocular experience, remember that you will need to double up on your eyepieces and that many binoviewers will limit your true width of field to significantly less than that of the equivalent binocular.