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The problem with an 8X50 finder is that, while you can see fainter objects with it, it has a narrower field of view which makes it a bit harder to point to stars with, and to hop around with when you've got that star. I usually use a 1X red dot finder in combination with an 8X50 to make things easier.
Regardless of whether you get a 6X30 or 8X50 straight through finder, remember the trick when lining them up with stars is to keep both eyes open - this makes things much easier than just aiming with one eye like with a rifle.
20 years ago, one could buy inexpensive 6X30 finders, and get good stuff. Nowadays, if you get an inexpensive 6X30 finder off Ebay, you can more often than not expect junk with lots of chromatic aberration.
In my old 114mm 900mm focal length reflector, when collimated I got excellent views of the planets, with high power inexpensive plossls. And for the brighter deep sky objects, I was always using a 25mm eyepiece in preference to say a 17mm eyepiece which technically is better for faint DSOs.
Regards,
Renato
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