I was in the same scenario. I have a great IT job and my company allows for a great deal of flexibility with hours and plenty of leverage to work from home. I also have an 18 month old baby girl and my wife is staying home to take care of her. This is our first one after 14 years of marriage and while I thought of doing the one week training, I just could not muster up the courage to go away from my family for a week or 2 weeks. Do not read any further if you do not have my situation or a family situation along these lines
Cost was not an issue for me. A week or more at a stretch was definitely an issue. I thought a lot about it and decided to stay local. My flying is great irrespective of whether I fly left or right seat. Also, I have a great flight instructor, who is mentoring me and flies for the airlines and has a very stable job (unlike many), therefore, making it easy to schedule.
Now, comes the hard part. I really wanted my CFI before the Summer started. However, I have barely gotten out of Oral/CFI/POH and am now starting on updating my lesson plans that I put together couple of months ago. This still leaves FAR/AIMs and endorsements outstanding and not to mention covering my lesson plans and getting further feedback to polish my teaching ability and lessons.
According to my instructor, I should literally have everything down cold. Having a great understanding is as important but he wants me to memorize and be able to recite whatever I am being asked and look at books, regs, notes, as needed during the oral exam portion. Now with a full time job and a family, I am taking my time. I am an avid runner and QOL is everything to me. We go out couple of times a week and I take my little one out one weekend day to spend time with her and give my wife much needed time to relax.
So I am doing what I did not do during private, instrument, and commercial training, that is, I am enjoying the process knowing well that I am taking way longer than an average CFI student. My advice is to look at it is a journey and not merely a Finish Line approach. I am getting closer to 40 and would love to have a CFI gig, build time, and/or have a part time 135 job or something along those lines so, time is definitely of essence here. But I suggest you dont skip enjoying the simple pleasures of life

It may be a long and drawn out process with other things life but with a proper schedule in place, you may save some money and really enjoy the process of getting there. In addition, do remember that a week or two week long training is a cram session and focus is very much on passing the check ride (others may correct me so, I may correct my wrong impression). If you feel you need to spend time on having an overall quality instructor background, you may want to take your time. However, on the other hand, you may already be at that point and just need to focus and use the extra push to get that CFI

Good luck with either approach and do share what you decided and what was the main factor(s).