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Hi Ben, #3 for me cause I started with a 4.5" reflector. You will see a lot more in about 6 months to a year as you develop your observing skills. Orion will offer you many challenges and joys. M 42 is the dominant eye candy but there are lots of clusters and nebulosity to explore. Eta Carina and area is worth a lifetime of observing in any size scope. Have a look for the gem nebula and the Jewel box.
As well if you want to try something a little strange for a light gathering instrument check out the 'Coal Sack'.
I guaranty that whatever from M-110 list is in your skies you will be able to find. The Sombrero in a 4 will be visible but not a lot of detail.
If I may make 2 suggestions; (1) download some free software so you know where to look (Stellarium is quite good for a moderate sized scope) (2) develop the skills and when and only when you have mastered the skills enough to use your scope to its limits buy a bigger one.
brian
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