I have been running McCrearys on the street for over 5 years. I don't think they hook as hard as Nittos(from what I have seen), but for the money as variety of sizes they are hard to beat. I have not personally tried Nittos due to the lack of sizes.
My best 60ft on McCrearys is a 1.57 and I am usually in the 1.6X-1.7X on them, I think with a few adjustments I will be able to get them to be consistent in the upper 1.50 range. Track prep makes a huge difference and does tire pressure.
They do have DOT stamps (Department Of Transportation).
The name changed and are made by American Race Tire, so that may be why you are having a hard time finding them. The last set I bought still said McCreary on them, the set before that said American.
There are several different types/compounds made by McCreary/American some are DOT and some are not. The Road Star is DOT approved (even though they still say dirt on the side). If that bothers you just remove the word "dirt" from them.
If you can't find them in your area let me know and I will forward you a place to mail order them.
Royce
http://www.racetireswest.com/ This is where I buy my McCrearys/American Race Tires. They ship as well. Hope this helps.