Many may think I'm trollin' hard, here, but I'm actually not;
R51. Seriously. Recoil similar to if not better than my P35 Hi Power, and about 1/2 as wide at the grip (grip is kinda long, being about 45acp-sized inside the magwell, but narrow) and just as ergonomic as far as no sharp corners digging into your palms. Unlike the Hi Power, it is far, far easier to operate the slide (not true for all R51's due to Remington incompetence). The backstrap safety is as 'manual' as a P7's squeeze cocker, but easier to operate when desired & much easier to actuate than a thumb lever, and more positive than a trigger dingus. Sights aren't half bad, either, and whoever was making Remington's barrels actually put out a very accurate product. Very good overall design should she decide to carry it one day, also.
And at least in my case, after some tweaking that should have never been required, the gun is quite reliable in non-freezing temperatures (I grease-lube it, and this stuff is more sensitive to temperature than oils or probably better gun greases). Even before the tweaking, it was fairly reliable (5% failure to feed from the crummy magazines, or so) but now it is similar to the Hi Power (maybe 1%, usually from a dud primer in the cheap practice ammo; apart from specific profiles that won't feed well, it's been very reliable with defense ammo like Golden Sabers)
I wouldn't go out and find one of the few R51's that might be for sale, since they were terribly made products. But supposedly Remington has 'hired the best brains in the business' to work over the R51 for reintroduction this year and promised it's 'gonna be beautiful,' so if this actually comes to pass as stated, would be a highly desirable firearm.
TCB