I agree about the quality being roughly the same. That's why I'd rather go for the FEEL. Every little angle and inch makes a difference. Ebay does have some great deals, but I wouldn't recommend it for someone shopping for their first bike. First-timers should always test ride a bike to see what measurements they prefer.
As a side-note for anyone shopping on Ebay. Make sure the person selling is as specific as possible in their description. Ask questions if you have to. It is the only way to protect against fraud. Example: A seller claims that they know nothing about bikes, and is selling a bike "as is." If you buy the bike and it turns out to have a cracked frame, you have no recourse to get your money back. If the seller had specified that the frame is in perfect condition, then you could get your money back.