You do not need to have lack of resources on the start.You can always go for a any Cloud VPS service, which give you more scalability, but the pricing would be close to costs you'd pay for an entry level dedicated server.
I want to ensure that I can grow if the site takes off.
Dating website are usually hard to advertise (unless you have your methods figured out already), having said that I would strongly recommend starting with a VPS and then when your site takes off simply move it to a dedicated server.
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I was wondering what your thoughts are on which path is the best to go down in terms of server.