Got one question, I'll be setting up a site which is going to to have very much connected content(category) each having vast no. of pages. SO what should I do dir.domain.tld or domain.tld/dir ? what would you like a subdomain or a directory? How will google react to the site content?
Well, I would recommend that you go with domain.tld/dir so that you will get some backlinks from directory lists and forums for your main domain and reciprocal links. But this is a rather old strategy and I would say that you should go with dedicated domains.
dedicated domains will be too expensive, and I think putting subdomains will lead to change of host. I'll do that if I can expect better SEO results from subdomains,