I have been using an Orion XT10 Dobsonian telescope for a couple of years now and I want to share my experience with this big and truly amazing telescope. For the price, you are getting a serious light tunnel!
I would recommend the following equipment with your XT10 telescope:
A good 9x50mm right angle viewfinder. I personally prefer the use of a right angle.
A 35, 25 and 14mm good quality eyepieces. The 35 should be a 2-inch. There is no need to spend thousands of dollars on eyepieces when your telescope is not worth millions$$$.
A good carrying case for the lenses, hard or soft shell.
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