I mounted my first "shooter" buck... Not the biggest, a 2.5 year old, that probably might break 130. I have had 4 deer since then, each progressivelly larger. Mounted all of them. I still look fondly at my first "big" buck.

I look at it this way... If I don't want to mount it now I let him walk, maybe next year IMO. I would rather shoot a doe. If I am not mounting them then what are they besides freezer meat! Economically I am pretty well-off so that has never been a concern for me... I understand for some it might be.

Anyway Congrats, and get him mounted otherwise you might regret it!