If you are considering the vortex strikefire, and you are prepared to spend money to get quality, then I recommend considering the Aimpoint Patrol Rifle Optic (PRO). I will admit, that I have not seen the PRO mounted on a pistol, so it might take some thought about how to mount it. But when people tell me they want a midrange sight for a rifle, I usually recommend that they consider an upgrade to the Aimpoint PRO.
The Aimpoint PRO is an entry level option from Aimpoint, but it is still a real Aimpoint. The price at about $450 is a bit steep, but in my opinion, it is a first quality piece of hardware. The glass quality, ruggedness, and battery life are better than the lower priced sights that I have tried. Personally, I would be comfortable with a mid-range sight like the vortex for sporting or recreational purposes. But if my life depended on the hardware, I would require top quality like an Aimpoint. So in this case, you don't need an Aimpoint, but you might still want one.
I will also mention that I like the balance of an Aimpoint Micro like the H1 on a big pistol, but it sounds like you prefer something bigger. The bigger sights do offer a larger viewing area, but I have shot a lot with an H1, and I don't find it holds me back. I would also recommend a 2 MOA dot if you want to go out to 100 yards. Past 50 yards, I find the 4 MOA dot usable, but smaller would be better.