DIP makes a very nice guard. I have one on my 452 American. I love it, but probably wouldnt buy another one at that price. There are a few others that Ive seen on ebay that Ive heard good things about.
The trigger guard wont shrink your groups, but if you have a good shooter that you dont plan on selling, I see nothing wrong with dressing it up a bit.
My 452 American has an aftermarket hand checkered walnut stock with a thinner forend and I also had the bolt jeweled. Its a keeper.