What level of VPS hosting does my site require?

What level of VPS hosting does my site require?
Hi all. I am in the process of creating a website for offer walls.
I’m confused about hosting plans. . My website is going to
have maximum 5000 members and 30-40.000 pageviews / day. I have been told that I should buy a VPS hosting. I have chosen VPS plan which has these features: 2 CPU cores, 60 GB SAN, 4 GB RAM, 2 TB Bandwidth. Is this plan enough for my site?