Seeking Justification

I love these boots.

And these ones.

I already have four pairs of boots, but no green ones or tall ones (as in height on leg, not height of heel). The green ones will stand out more, but will match less. The grey ones will stand out in their tall buttoned glory. They are also the right color for getting dirty in the snow. The grey ones cost $30 more, $20 when I use my coupon code. I just convinced myself that the grey ones are the better buy; however, I'm still not sure if I'm allowed to buy any boots at all. Hm.