I already have a domain. Who has chap hosting. I only have about 50 activate members. Here my current site. TechSober.com they host it for me. How much would I need for around 10Gb of attachments a month, and under 100 members?
Shared hosting is from around $5 a month to $30-40 a month
VPS is from $7 a month to $60 a month
Dedicated servers from $25 a month to the skies the limit a month.
Best thing I can suggest is head over to WebHostingTalk and review the offers in the appropriate area (shared hosting, VPS, dedicated server) and then search for reviews of those hosts. Without a price range of what you are wanting to pay it's kind of hard to recommend anything.