I think the S&W e-Series is a fantastic bang-for-your-buck. Some folks here poo-poo it because of the external extractor, some because of the unconventional slide serrations, but neither bother me. I like that it's a bit unusual. But its a forged stainless steel (slide & frame) Series 70-style (titanium firing pin, no FPB) 1911 loaded with features...match grade barrel, front strap checkering...and something I've never seen on a sub-$1K pistol, factory top-of-slide serrations!! Mine has over 3500 flawless rounds, truly...zero malfs with several different brands of ammo using the factory magazines.
There's a NOS one on GB right now for under $900 (item 911454769)
The SA Ronin looks nice, but you wont get factory FSC...if that's important to you. I, personally, dont think Colts are a good "bang-for-the-buck" at all since the fanboys keep the prices higher than other production brands...especially on the pre-owned market. And I dont believe I've ever seen a new Colt sell for less than MSRP. By comparison, my E-Series had an MSRP of $979, and I got it on sale from Buds for $779. However "bang for your buck" is a bit subjective depending on your needs and budget. I will echo the other sentiments here that if you're thinking about using whatever you buy as a base gun for a build, Colt or Springfield (in that order) would be the wise choice.