I think that your hair looks great and like all of us on this site we are our own worst critics.
I would, in my opinion, not think about HTs at this time especially because you are young, have little loss (I assume the temples have always been like that?), and financially the amount you want to spend will NOT get you what you are looking for.
First $2000 will get you on average around 400 grafts from any of the top docs here and that is having a strip procedure. That will give you very conservative improvements on the temples, but not be able to bring them forward enough to make you happy.
I would say: Save more money, do a lot of research, wait years to see if you actually will have more loss, then decide whether or not to go through with this.
Leave well enough alone (or so the cliche states)