Large Classical Record Dealers

Hi all! I am beginning to get into vinyl and am looking for places to purchase classical vinyl material and had a few questions:

I'm a bit leary about Ebay, but they have a good selection on things I'm looking for. Any recommendations on how to decide between vendors? How can I trust their vinyl grading? Is it worth even trying to go this route? Any prefered vendors that you guys use?

Another option would be going through a dealer. I know of one, namely Sikora (http://www.sikorasclassical.com/inventory.htm) and was wondering if there are any other large classical vinyl vendors that you guys might recommend? Is this a good route to go, compared to Ebay? I like the fact I would be establishing a relationship with a vendor, but I'm not sure how cost effective this might be...

Finally, I'm not very knowledgeable on all the various gradings and terminology... For example, all I can really offer is the artist and composer that I'm looking for, for example Gyorgy Cziffra's Hugarian Rhapsodies by Listz... I'm not really sure how to get from this information to a recommended label, pressing, etc. Any ideas? This was my motivation for going with a large record vendor, but maybe I could sort this out for myself?

Thanks everyone!