Bob B.-
The nice thing about European mounts is that the deer look bigger than if they are cape mounted. It costs not much more than your time and the results are striking. The antlers keep the live deer look so the skulls do not look like found skulls which have gray antlers.
You are right about Iowa growing big deer; just take a look in the record books. It is partly an accident of genetics, in which larger deer must have survived the over hunting early in the last century when they nearly went extinct. It is also the fact that it can get brutally cold here, minus 28, in enough years to keep deer with small genetics from surviving. It also does not hurt either that our deer are corn fed.
It took me a few deer tags before I got one as big as the one you shot, I was a lot older too. We tend to show pictures of the bigger deer, not the fawns. (We shoot does and fawns because of over population where we hunt and because extra antlerless tags are $11 and it is legal for you to use another person's tag during the shotgun season if they are in the field with you.) Congrats to you both. Jordan did eat venison; the fillets never got down to room temperature before they were in the frying pan. My boy, Matt, was not hunting. He was TRYING to be a photographer and Jordan needed wheels to get to his grandfather-in-laws place. Matt forgot to press record when Jordan shot his turkey.
Matt did not want to use his firearms buck tag up in the muzzle loading season because then he would not be able to hunt with me and our group of family friends on our traditional shotgun season hunt. Hunting with our dads or sons is the greatest.
Go with the European mount. I think you will like the result. Save that cash for the record book Connecticut deer you get to watch your boy shoot in a couple of years.
Good luck to you both out in the marsh. Knock an extra green head for me.
Bob E.