Dr Glenn is fantastic (new world orchids). I have bought from seed engei on eBay but I found I overpaid for most of my plants. I've never bought from orchidweb.
Neos and sedireas are fun and they give you a chance to be inventive and innovative. They will teach you that you can not only care for them but that you can make them thrive if only you pay attention. Push the envelop...test yourself and your plants will reward you.