I have a
fully-managed BABY VPS that should work great for your young forum!
For $29.99 a month, it is FULLY-MANAGED and comes with 10GB storage, 250GB transfer monthly, and 512MB of RAM. There are no caps or limits on this account, and even though it's fully managed, comes with full root access and a full control panel just in case you wish to manage any part of it yourself (add a domain/email/ftp account on the fly, etc ...)
I have several clients running forums on this VPS, and it is a proven configuration for this purpose.
We offer VPS configurations right up to 8G of RAM and 3000GB of monthly transfer, so
your VPS can be easily and instantly scaled up (or down) to suit your current needs.
If the day comes that you want to move your forum to a fully-managed dedicated server, we again have several configurations available, or will build a custom-configured server for you, and move your forum - FREE of charge - to a dedicated server.
A1 Web has been operating since 1998, is financially solvent, and has had a proud, active GFY presence since 2004, so we are not going to go bump in the night like some other small to medium size hosts might.
I would love the opportunity to earn your business. Open up a dialog with me, and I can answer any other questions you may have, and set up a VPS for you in a matter of minutes! My personal email is
eljefe |at| a1websolutions |dot| com, or you can reach me at the support email listed in our contacts ("attention: Tim" in the subject line will filter to me too)
Cheers!

Tim
http://a1websolutions.com/contact.html
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