I found more than 20 long tail keywords with exact searches > 1000, CPC > 1$, low competition and EMD. All the keywords are in one general area, so they can be combined in one website too. The area itself is very competitive, so if I make authority site I'm afraid it would be difficult to rank. So, my dilemma is what to do. MNSs rank faster but needs lots more work to be done, though the authority site is opposite. What would you suggest?