My take is that you should throw good money at making your mixing room acoustically balanced, a solid monitoring system with high head room, and a variety of good to great mics.
All the above are the mechanical aspects of your recording. Everything else is about electronics. While electronics are going to play a roll in overall sound, it will be NOWHERE are much as the big 3 listed above.
After that, I think your mixing console is the next biggest deal. How you sum all them tracks together, and how you are able to route audio to everywhere it needs to go is a big ol' deal! If you don't know why, then you aren't at the level where you would appreciate better preamps anyway. You have some VERY big considerations here. And if you want to talk about how to decide what is going to be best for you over the long run?!?!?!?!?!?!?! Oh boy!
After that, well, it is whatever you want it to be.

Preamps, dynamic processors, etc....Whatever floats your boat, or serves the production approach you take to recording.
Don't sweat preamps too much. Even I get sucked into this silly battle of opinions about them, but in the end, I have done some VERY solid recordings that people thought had great sonic detail with "lesser" preamps. Some of my best work ever was done with almost exclusively ART and Mackie preamps. Nobody that has listened to this stuff could guess what few instruments in the mix were tracked with high dollar preamps at all! I mean, for the 10X price difference, you would have thought those few tracks would have jumped right out of the mix and blown you away with their obvious superior sonics right? Well, they didn't, and what was amazing was that throughout some big session I have done, where the budgets were there to use MORE high dollar pre's, we were finding that the high dollar pre's just didn't sound all that much better to justify the rental costs. Not by a long shot. In fact, we were finding often that the ART pre's were standing up quite well on most stuff compared to Neve, Focusrite, Telefunken, Demeter, Sytek, etc... In the end, we just stuck with the ART signal path and people have held these productions in very high praise.
I don't think preamps are going to make or break your production. Good solid mics and mic technique, good monitoring, and good environment to listen to it all in WILL!