I received 3 eyepieces of reasonable quality when I bought my Bintel (GSO) Dobsonian a few years ago.
The eyepieces Bintel included were pretty decent...As has been pointed out previously from others experiences, I am assuming that other suppliers supply decent eyepieces with their scopes too.
I also heartily endorse using what you get (or already have) for a while before you run out and start buying new eyepieces. The more experience you gain the more capable you (we all are) become as observers. Experience will also help you identify the things that you like/want in future eyepiece purchases. One of the "fun" parts of getting together with other astronomy hobbyists is trying out and sharing each thers gear!
There is no substitute to getting your scope (or someone else's) out and using it!
So in summary, pick a "reputable" shop to buy your gear from and then get in to enjoying it.