Jeff--
Regarding your question about Dealer.com, I can honestly respond from my 2+ yrs experience with this vendor that they are a cut above the rest.
They understand proper site design (code), "visibility" with search engines and the calls-to-action that induce otherwise anonymous visitors to transact with your site.
All too often, Web vendors capitalize on dealers' general ignorance of Web technology and sell them on the buzz and bang of Flash intros, talking spokemodels and other elements which bring far less to the equation than they take from it (BZ, Izmo, Dealerskins, to name a few....sorry if I'm hurting any feelings here). In contrast, Dealer.com uses primarilty static HTML in an effort to maximize search visibility, and they pay much more attention to navigation structure and other potential roadblocks to your visitors finding what they are after and submitting a lead.
Try this:
Google "site:
www.siteaddresshere.com" using example sites given to you by various vendors. This will show the number of pages within the dealer site domains that are currently indexed by Google and available to be returned on prospect search results. Many will only have 2 or 3 pages indexed, while the average Dealer.com site will have a thousand or more. What's more, one of the reasons this is the case is that Dealer.com's integrated inventory piece actually creates a separate indexable (is this a word?) page for each vehicle detail page....talk about a page full of relevant keywords ready to be found by your prospects.
Great support, back-end, reporting, blah blah blah...
No, I don't work for Dealer.com -- I'm an e-commerce director who is a true believer from previous experience with other framed-up, Flashed-out vendors whose sites yielded low lead counts. I could go on gushing about Dealer.com for days, but I'll shut up now..
Hope that helps!
Kevin