vBB 2 and 3 Hardware needs

[Lord Chaos]

Ok, if you have a fairly large forum with a user peak of 1000+ users. 1+ million posts, 300-500+ forums, 100+ usergroups, 10-20 styles and so on, what...

1. Hardware would be optimal?

2. Which Hardware is highest priority to have as fast and as much of as possible? (ie. RAM, Harddrive speed, etc.)

3. What hardware would ensure this forum would be able to expand even beyond this without any problems?

Please answer these questions with complete disregard to cost, it is irrelevant wether the suggestions costs 100 dollars, 10K dollars or 100K dollars, all that matters are that they are correct.