I have a single wordpress website (blog) currently running on a VPS with 4GB Burstable RAM, 3GB Guaranteed RAM, 3 usable cores each 3.2 Ghz SAS10k RPM storage 150GB. My blog has about 40 users and almost 25UV daily.
I am planning to further expand my website and add a forum to my blog. All users will be synchronized as forum users as well. I have no problems with my website’s speed and performance right now but I am concerned if my new forum will cause problems and that my VPS would not be able to give me the same performance. Should I get another VPS or should I get a dedicated server? Which would be better in my case? I do not want to compromise the performance so if I would not mind paying more if there would be a significant difference in the performance.