Depends on your budget, If your forum is small / new you don't need a VPS straight away, shared hosting is fine. However if you are set on a VPS legionbox seems to offer more bang for your buck however i have no experience with either so cannot comment on performance.
I have been with HostingSource.com for over a year now and they have been nothing but great.
I am totally impressed with these guys. I just hope they don't grow too large and lose the foundation that is making them so impressive.
QHoster.com and libertyvps.net VPS accounts are noteworthy due to their unmatched services.
I am happy with their services and will recommend them to anyone looking for good hosting at affordable price.
QHoster.com (GHR8WY5P4P) and libertyvps.net deals are worthwhile.
Awesome top-notch hosting is available from them.
Support has to be one of the best around. You can get someone on the line almost immediately.
VPS accounts from QHoster.com and Hosting.uk are good enough to sign up with.
Customer support was made easy with their online chat feature. Not technical issues so far from my end. Everything seems to work well.
My site is always up and running. When I update my site, changes are immediately noticeable. The VPS control panel is simple and clear and works just fine. Hostforweb.com offer a choice of the most common hosting control panels and even installs them for you. I chose a free one, it's well-organized and user-friendly and easy to navigate.