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Going to host a big forum and need to find a good featire-rich web hosting account.
What are your views on Libertyvps.net and Rockhoster.com vps hosting solutions? Uptime, features, bonuses?
What forum software is better: phpBB, vBultein, Ekarte, SMF? Why
Is it the hosting provider I can rely on?

RockHoster.com offers the most powerful anti-DDoS solution on the market. All movement to your site (or server) should first pass through our branded DDoS protected proxy before it is sent on. This guarantees that just clean traffic achieves its proposed end of the line. Good set up for ecommerce sites, the cPanel is excellent and choice of shopping karts is varied and very easy to set up.

All forums you mentioned are better to use, phpBB, vBultein, Ekarte, SMF.
phpBB is very large community, come with extensive plugin and theme selection.
vBulletin is paid software tool, that has very good reputation for performance and scalability.
Ekarte comes with modern interface, that is newer option you can try.
SMF or Simple Machines Forum is very much ease of use, that is also large community.

Ultimately, you can try out different software and check out which one best works for your needs.