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An Orion ST-80 works very well at low power. The ST-80 OTA weighs about the same as a Nagler 31mm.
You can pick up 2nd hand ST-80's in the classifieds for $100-$150.
They come with a 1.25" focuser so if you stay with that focuser, you'll be limited to plossl's and narrower fields 5 deg with a 40mm and 4 deg with a 30mm plossl. As a finder, you don't need a fantastic focuser for it so you could remove the 1.25" R&P and replace with a custom machined simple Aluminium or a 3D printed plastic 2" sleeve focuser.
With a 30mm 2" superview eyepiece, you'll get a 13x80mm finder with a 6mm exit pupil and a 5 degree field. With a 40mm 2" superview you'll get a 10x80 finder with an 8mm exit pupil and ~6.5 degree field.
It is also pretty easy to install your own cross hairs and led illumination on a large finder and you can easily get adjustable guidescope rings for them.
Joe
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