Personally I use the HGU-58/P. It's lighter than most other helmets, which is a big consideration when you're wearing it for more than a very short period every day. It depends what you're doing, however. I know a lot of pilots that prefer helicopter helmets such as the SPH-5. They're a lot cooler, with airflow around the base. With mine, while it's light, it's also hot, and despite having a "temperfoam" self-adjusting liner in leather, it develops hotspots that feel as though they're burning after a while. A slight adjustment on the helmet takes care of that, from time to time, but it can be uncomfortable.
The helicopter helmets tend to be wider and don't fit well in a cramped cockpit with a small canopy. A big concern if you're going to be spinning your head around a lot. They're also heavier, if you're going to be pulling G's or maneuvering a lot, then a heavy helmet can get old in a hurry.
While the standard helmet shell is fiberglass, I had mine custom finished in kevlar, for better impact protection. It didn't cost a lot more; about a hundred more, I think.
You might try Flight Suits Unlimited, also selling as Gibson and Barnes.