Hi MintSauce, welcome to the forum!
That's a very good price for an 8" scope, there's several members of this forum who have that exact same scope, or the 6" or 10" derivative. I have the 10". Some of us got them from Bintel, others got them from Andrews. They are the same scope, imported from GSO in Taiwan. They are good quality for their price.
You'll be very happy with an 8" dobsonian, it's a great beginners scope and you'll see plenty of great things with it. It's portable and easy for 1 person to use and setup.
For the other 2 plossl's, I got a 15 and 32, it's up to you what other 2 you get, but you could also consider getting a 2x barlow. Perhaps you could ask for a discount on the SV eyepieces if you don't get the other 2 plossls.
Guys that have a lot of experience with eyepieces might have something to say about the SV 42mm and it's suitability in a fast scope, something to do with eyerelief and coma
Those with more knowledge than me will correct me. The same goes for the UW30mm - it has been reviewed on this forum and looks like a good eyepiece, though you can expect some coma around the edge of the field in a fast scope.
I'm considering getting the SV's or UW30 myself, i'm hoping to try before I buy, either from Andrews or maybe get a loan of one from someone else.
Good luck, you can't go wrong with a 8" dob at that price, many years of enjoyment to be had.
btw where are you from? How did you hear about the forums?