I too like the Red Dot Finders, I recommend the metal ones with adjustable intensity - i found it useful depending on the whether you are observing from town or country - and various reticules - which can help in certain situations. About $70ish on eBay.
The great thing about Red Dot finders is that they do not magnify and as such you have a greater sense of where your telescope is pointing relative to the constellation you are looking towards and bright stars around. I have found this to be really a great improvement in pointing accuracy simply because it's a lot easier to position yourself "2/3 from that bright star" - this can be more difficult to achieve in a regular viewfinder when you cannot see the bright star in your field of view to begin with.
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