I'll be honest. Poorly titled threads are my pet peeve. But hey, I get it. Not everyone thinks things through, especially on the internet. My take is to give people the benefit of the doubt as I've had my blunders too but after reading your posts...well...I'm just struck dumb at how illogical it is.
Let's go through it step by step.
Title: "
Need help with buying decision"
I'd respectfully submit you need more help with correctly titling a thread and choosing the correct forum - more on the latter in a bit. Asking
WHAT your question is in the title will get
MORE interaction than a vague, generic, and lazy "need help" or "quick question". Easier to find in searching too.
Let's consider your posting and see what we can improve:
I have committed myself to purchasing an M3...
May I kindly point out:
Model 3
It is an entire forum dedicated to Model 3 - which is what you purport to be considering in your poorly titled posting. You posted this thread in the Model S forum. Why the S over the 3 forum...we may never know, but hey just so you know.
...but can only financially justify one of either the LR without FSDC or the SR+ with SFDC.
Hey! Look at that! There's your thread title!
"
Can choose between M3 LR with No FSDC OR M3 SR+ with FSD - Advice & Insight Sought"
...see how much clearer that is then "Need help with buying decision". Now even a correct thread cannot overcome posting in the wrong forum, but we'll start with the small issues and work our way up to the more advanced topics.
I do not need the extra range that LR offers for my daily lifestyle, so I am leaning towards the SR+ with SFDC. I have to choose between one or the other, and am struggling with the decision.
It sounds like you've almost already answered your question. I can suggest is this: if your circumstances change for the better at a later date, you can always "upgrade" to FSD at will but will probably not be able to upgrade the battery. Not sure if that's worth it for you - my guess is probably not - but food for thought.
I would appreciate any comments on which you think is the better option.
Learn to descriptively title threads and post on the releveant forum and you'll get far more responses.