I understand your concern, and would agree with the suggestion that adding in Nizoral would be beneficial for your hair.
Nizoral's main benefit is that it fights Malaseezia yeast, a natural scalp parasite that we all have on our heads. This yeast is an irritant, and causes an immune system/inflammatory response very similar to that caused by male pattern baldness, and the inflammatory effect of both the Malaseezia and male pattern baldness can be synergistic. By keeping the parasitic irritant at bay, Nizoral removes a major ambient source of scalp irritation. In doing so, it reduces the overall inflammatory response your body has to the male pattern baldness. Additionally, its also a mild anti-androgen, so it's a relatively cheap and easy to use tool and a good starting point.
As for adding in more potent treatments, you need to weigh out the fact that all of the current treatments, once started, need to be used for the rest of your life if you plan on maintaining any of the gains obtained from them.
There are two schools of thought on this. I am sure that many here have a goal of restoring all their hair (an "NW1") and trying to keep it for the rest of their lives through the use of the treatments. I tend to have a different outlook, I think that a good goal would be to try to maintain an "age appropriate" hairline, and the adding in of excessive treatment cost and tediousness needs to be outweighed by the relative condition of your hairline, for your age. I don't mind having a little recession, but I did want to thicken up some of the thin areas, and that is exactly what I have achieved.
Also keep in mind that hair recession and thinning does not occur overnight, or in a straight-line continuous pattern. It occurs in fits and starts... you will have a period of seemingly rapid recession, and then it will stabilize, usually for several years, then followed by another period of recession, then stabilization, etc, etc. Obviously, you have had a recent period of recession. I would hesitate tossing the kitchen sink at the problem right now, as if you are okay with your hairline now it might not degrade further for years, and doing treatments now would, in effect, be keeping hair that you are already going to keep even if you didn't take the treatment.
To determine this, recession events are usually accompanied by pronounced scalp irritation or itchiness. This is not necessarily the case, but it is common.
Taking all of this into account, if you are worried about your hairline but not yet feeling it to be an impending disaster, I would suggest getting started on just the Nizoral for now, and take pictures of your scalp and hairline. Then, over the next few months, make observations of your hairline and see if you are noticing any telltale itching in the traditional "male pattern baldness" balding areas. If you notice unfavorable changes from your baseline pictures, you might consider adding in finasteride.
Lastly, your username appears to indicate you are a Marine. If so, thanks for your service.
