Things I'd change, do what you like.
1. Google ads taken off. As mentioned, it looks unprofessional and are you really looking for me to click an ad and leave your site?
2. Take off the annoying SitePal. Webmasters know how to surf and buy content. Especially ones shopping for content.
3. In Firefox the tables are off on the left. Mainly the rounded corners.
4. I'm using 1024 width for my resolution and your site doesnt fit. Shouldn't be too much work to size the top width images a bit for good view for a fair amount of your potential customers.
5. The popup previews with no scrolling is a pain to view the fullsized quality.
6. There are spelling and grammar errors. Lots of them. It will be quite a bit of work, but every page and every models description needs to be proofed and corrected.
7. Your "10 New Sets" have no pricing listed.
8. Some of the pricing lists $xx and others are xx$ or $gold. Huh?
9. It seems maybe you have different license agreements? Gold and Royal I noticed. But I can't find the license agreements.
10. Are 2257 docs provided? Thats a selling point you should be listing.
11. Don't force your aspect ratios so hard with your thumbs. For example you have
http://classycontent.com/content/pics/small/1745_1.jpg which is a width of 199 and when you force that into a 110 thumbnail it looks too distorted.
12. It would be nice to be able to search before registering, but I understand a content store needing to push to register also.
13. Your "News/Deals" section has no deals. Only bland news.
14. Hey, I found the 2257 and license agreement info. Tiny links on the top right. Don't make me look so hard for selling points like legal docs that not all content providers give out.
15. I don't mean to pick on the spelling and grammar too much, but it needs a makeover bad. Photographers, not "Photografers". Affiliate Program not "Programm".
Looks like you have some nice content and with some cleanup it should look really nice. As it is now, it comes across as unprofessional to me. With the tables off and especially the spelling and grammar. I'm not looking for content from a provider that is gone the next day, and right now it looks like one of those type sites with the grammar and spelling being so bad (I don't mean to bash, just offering advice to help). Get your touch up work done and it should be looking good!