Several aspects are important, like
- what's your current ranking
- competitors strength (assuming it's high due to keyword)
- linkbuilding done already
- and more and more and more and more and more and more
To ask the way you do is definately not the right way, all you will achieve is getting some offers which are gonna push you to spot #1 for 250$. Right, and the next stage is the sandbox...
You need to order a wide range of packages, neither my package or any other linkbuilding service will help you to achieve the spot #1 without doing anything different.