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Actually I think NicheBot seems awesome because it includes SEMRush and WordTrakcer tools, futher more many others.

I recommend you to checkout MixRank which you can use to spy all your competitors ads, also their A/B testing ones! http://mixrank.com/

I'm not an SEO Guru just a junior on his way so think twice my advice before accepting it, it's just an opinion

From my point of view I'd choose a smaller submarket of the big one you're talking about. Travelling, tourism have big market with strong competition. I'd go for long-tail keywords on subpages, optimize them for those keywords. On a long-term I still wouldn't go for the whole market if the competition is too strong with strong SEO. I'd choose smaller submarkets which can be defined around keyword groups and just one keyword. In the title use the most searched term and the content should contain more keywords, preferably long-tail ones. I think from a marketing perspective: it's much better to occupy a smaller market then become the 100th on a bigger one, because not your product or service but your position in your niche will define your business strategies, goals and success.

Destiny - this is the best idea in your question! I'm sure it's a good idea and it works!

Keyword Density - is the opposite do not overuse keywords and their plural forms, it's a bad practice. http://www.seomoz.org/blog/perfecting-keyword-targeting-on-page-optimization

Hope this helped!

Hi Stephen,

I'm in Budapest, Hungary right now and have some connections in Serbia too. Let's continue in PM!

Thanks