Hello Dognus and welcome to CAP.:bigsmile:
I think a balanced approach of both is the most effective strategy.
Initially targeted traffic is probably your best bet if you want to begin earning revenue. It can takes months to develop a steady stream of search engine traffic so QUALITY TARGETED advertising is an excellent way to jump start your business.
As time progresses though, you will want to hone your Search Engine Optimization skills as this is an essential part of the business. Purchased traffic can then be reduced once you have the rankings in Google and MSN established.
Good Luck and keep us posted on your new site and progress.:thumbsup: