i might be able to make a suggestion or two, but maybe you could let us know what types of things you're after. for instance, do you want something that is more traditional MF, group, 3-somes, lesbian, gay, bi, dom/sub, etc.
maybe jot down a couple of things that turn you on when it comes to porn and we can give you some good suggestions.
many sites, like adameve.com have descriptions, ratings and reviews. you may want to check them out too.
Can't help you on the MM one but try an old Andrew Blake flick like Hidden Obsessions for a nice MF tape. Kinda erotic with some good sex- a decent couples tape.
Also check out www.adultdvdtalk.com, which has a great forum but also hundreds of reviews and links to well-priced sites for ordering - it has helped me be a more informed porn fan, so I don't spend too much on crap and know when something is well-made!