I largely agree with shootist when talking 223; I see 100 yards and in as short range, 200-300+ as mid with long 400 to 600, with anything above that really stretching limits of 'normal' 223 ammo.

Whether you need a 2.5-10 or 1-4....really depends on the proportion of shooting (and target size) and type of shooting you intend to do at what range. If you see yourself spending the vast majority of time closer in and shooting fast, the 1-4 makes more sense. If you see yourself mainly at 200 yards and up (and also closer if speed is not a factor), the 2.5-10 would be a better choice.

Totally agree on the quality of glass aspect as well as outright magnification.