as for me, I'm not quite sure that the impact factor ought to be the central point when deciding what journal would be the most satisfactory medium for your work...
... To my mind the main point ought to be THE FACT OF PUBLICATION ITSELF. First of all, it should certainly be published in the regular way - that is in a professional journal.
Second, the journal should be publishing the topic you are dealing with - this way you ensure that your colleagues would find your publication and read it.
As to the estimation of your actual results - there are basically two kinds of research workers:
1. Those who choose some topic and follow studying it all their (professional) lives long. Usually, their efforts are recognized at some particular point, and if they strive for this, they might appear as the "outstanding, renowned specialists in the field"...
2. Those who are similar to the 'criminal detectives': Mostly they remain unnoticed even irrespective of their actual achievements, all their lives long they are usually treated as ALIENS - and, besides, after their Final Departures, they get normally forgotten... There are only few counter-examples all over the world...
But these are just the 'criminal detectives', who're capable of getting the TRULY NOVEL GROUND-BREAKING RESULTS, for these are they, who are truly devoting their lives to their work...
... It should be a personal choice of every researcher, which category he/she would like to belong to...
If you choose to belong to the first category, it is wise to look for the Impact Factors of the journals you are submitting your work to...
If you choose to belong to the second category, then the main thing is to correctly and regularly publish your results, for "the manuscripts do not burn away"