I've always believed in steel toes. I've had good service out of some basic Kodiak boots with steel.
That being said, a guy I was working for got me a great deal on a pair of Dewalt boots - my first pair with composite toes. Now, I'd have a hard time going back to steel, the composite toes are so much nicer in the cold - and, at the same time these Dewalt boots seem to breathe better, my feet stay cooler in hot conditions.
I'm not sure I understand the USA ratings on safety boots. Up here, a green patch means you have a steel shank too - I wouldn't wear boots without the armoured shank either. Had a quick look at boots the last time I was in Upstate NY, I couldn't decide if the ANSI rating included the shank - I'd guess yes, but don't know for sure.
Cold may not be an issue for you (I'm in Canada), but some guys like the composite safety boots for the lighter weight.
Spend the money on a decent boot, some people buy a cheap boot then end up avoiding using them because they are uncomfortable.