Helmets are such a personal choice on style and look. Even before that fit is the most important.
As you mentioned, buy the best you can for your head. My top two helmet brand suggestions to the masses are Arai and Shoei, and interestingly they both have somewhat different fits. Some heads fit Arai best, some Shoei.
I've trird and owned many other less expensive helmets with some enjoyment (e.g., suomy, hjc, bell). Shoei doesn't fit me as well as Arai, so Arai it is for me at the top.
While I'm all for Arai, Simpson not so much. Reminds me of the stig on bbc. I like to be a little more individual.
I bought the following to match the RC51 colors and have an in-your-face design (had more plain designs and some more pop designs, I like designs that pop). Love it. This is an RX-Q and it is a similar helmet shape to the Quantum you have. Either way, check out the RX-Q options for you if the Quantum e fit well. This pic has crazy zoom capability. Enjoy.
I've also had the top of the line corsair / RX7 helmets. Great helmet, going without saying. But note with the extra air flow comes notably more noise. Personally, I prefer the Q on the street, the corsair on the track (where on a hot day airflow is king), but graphics above all else.