In general, I'd say any S&W 1911 is probably pretty good.
What "earlier" means to you is unclear.
Early S&W 1911's had a Mochak designed firing pin safety that works off the grip safety. They were a pretty good design and robust, but most 1911's don't have a firing pin safety, and since 1911's are a traditional type of gun, usually purchased by traditionalists, S&W eventually dropped the firing pin safety in their 1911's.
The first models without the firing pin safety were the Ti models, those that had a Titanium firing pin, that gave some drop safety-ness, without a firing pin safety. Next came the E-Series, also a Titanium firing pin. I don't think S&W offers current models with the firing pin safety. If you like a firing pin safety in your 1911, and that gun is earlier enough in the production cycle, that would be what you want. If you don't like a firing pin safety in your 1911, you may want to check to see if that gun has it before you buy.
S&W's other non-standard 1911 thing is the external extractor. S&W does a pretty good job with external extractors, but the later E-Series guns got the extractor from the Performance Center guns and they are a little better.