Should You Make a "Blog" or 25 Micro-Niche Sites? (details inside)

Greetings fellow warriors!

I found an affiliate product I'm absolutely in love with and I'm about to start marketing it adamantly. The sales page for the product I want to promote gets 60,000 unique monthly views, and is in an "evergreen" niche that I have expertise in.

The problem I have right now is that there are 5 major keywords that could be used to promote the product. These key words are different ways of stating an underlying problem, but they're each unique. Each of these "root" keywords gets a pretty healthy amount of traffic, but I'm not sure how to include them all in my marketing efforts.

Strategy 1: Write a Single "Blog"

I can create a "blog" in the blog sense of the word. Rather than writing lots of quick-and-dirty articles targeting specific key words, I will write longer articles that are designed to build a solid relationship with a readership that grows over the next 3-6 months. There are lots of lateral topics that can potentially feed into the 5 major key words. I (roughly) anticipate having 30,000 unique monthly visitors after 6 months, with higher conversion rates to the product. And this also means I can build a pretty solid list.

The drawback is trying to reign in too many keywords, thus diluting the power to speak directly to the problem. And this is a problem that should be solved within a few months of the person looking for help - it's not like Internet Marketing, where the problem persists for years.

Strategy 2: 5 Niche Websites

I can create 5 different websites, each of which targets a different root word. These sites would be very specifically tailored to each problem, BUT I could get some savings by recycling my presell pages, as the product essentially solves the underlying cause of the problem behind each key word.

Strategy 3: Break each of those 5 Niche Websites Into 5 = 25 sites

Each site would target 20 or so key words. This would be the typical quick-and-dirty article marketing strategy that many advocate on this board.

Overview

At the start, I don't feel that blogging is particularly risky relative to the other mediums. What's risky about it is "diluting" the way I target key words in the long-run. It may be too much trying to reign in too many keywords.

I am a huge believer in the power of video, and I think blogging is a more solid medium through which to get a powerful return on video. (i.e. video requires a lot of work, and if you have a solid readership to connect to, you can be more certain that your video will be well-received). In fact, you could extend that point to the blog in its entirety - it's a good opportunity to do long-term research and continuously pitch to your niche.

The Big Question
How do you handle the way you target keywords when the niche you want to go into has the potential to be broader in scope than a "typical" article marketing website?