You want it to look like this, use vBulletin. No ifs, ands, or buts its the best forum software out there. If you want to be cheap and save $150 on the reg fee fine, but you are going to waste a lot of time doing things that vB does out of the box.
As for customizing vB's skin to look like this. All you need is a logo, all of the colors can be customized within its admin CP.
Your biggest hurdle in starting a forum is the traffic. Jon had a loyal following on his forum and good contacts, he was able to reach a core group of the target audience on day 1 of launch. My most successful forum I already had a stream of several thousand targetted uniques in that niche from the start.
One word of warning, the amount of work you put in to the forum vs the revenue you'll see from it, at least in the first year or two is probably going to look ugly. Lee is selling this huge guitar forum on Sitepoint right now, he says it makes $300-$400 a month.
Some niches you can do better, and I mean a lot better. I suspect that Adam Dicker who owns the domaining forum DNForum.com has pulled in close to a million dollars off of it from subscriptions, plus whatever else from advertising.