Put a Leupold Mk 4 Lr/T 10X40 on a Remington 700 Varmint gun in .243, at the time close to 3X what I paid for the rifle. Also put it in an H&S precision stock which cost about the same as the rifle. Did that about ten years ago, whenever I get around to burning this barrel out (life has gotten in the way of serious rifle shooting a few times) I'll probably ditch the stock, put it in some type of chassis, put a new barrel on it and get the action trued. As it stands it'll outshoot me by quite a bit, none of those improvements will make a difference.
My choice of optics though: carried the same scope on a deployment mounted to an accurized M14. Heck now that I think about it, I had the same Badger Ordnance USMC rings too (about 1/3 the cost of the rifle if we are still using that math). The scope can take a serious beating, is crystal clear and has repeatable adjustments. When I say it can take a beating.... I put my work one through some serious work. It was more beat up than the rifle when we came off of that tour. Glass was still clear, never lost zero and still repeatable adjustments. Worth every penny, this was 2009 money but I recall it being around $1600.