My 2 cts (I'll celebrate my 10th year here in 1 month exactly), considering you're likely in your late 20s/early 30s;
- Condo for 40K = Doable, even in an OK area (among the links posted before, the smallish 1 BR in Villa Crespo = 17 square meters...). But in 17 sq. meters, you really need to love a lot your SOH (and reciprocally). Forget about kids in such a tiny place. For renting it when you go away, don't expect much (450 USD max per month for a short term rental with everything perfect? Everything perfect = more money to invest). Many other issues will arise since you don't know the country (e.g. if you want at some point to leave the country = the local IRS will ask you to prove you didn't rent the condo, otherwise you'll have to pay fines, etc.)
- Money/Budget plan = in your 1st post you say "go to school there". That's a bit vague. Universities are free here if you have residency, citizenship, etc. but that won't be your case (unless that's for your kids but that's a strange way to plan things). Main problem about your budget plan: like in any country, expect to make mistakes the first year you live here, this assertion is even more valid here = You need to multiply what you expect to pay by a factor of 0.5 if you don't want bad surprises and a nightmare ending.
- Your precise project = It seems you didn't visit this country yet (could be wrong). Like for any business project, you need to have enough cash to pay for all your expenses during 2 or 3 years if things go wrong (and this remark is even more valid here...). For Import duties & such, maybe can you find solutions to pay less buying in Mercosur countries, etc. (no clue).
Conclusion = if you were my best friend, I'd tell you to be very cautious (I like to take risks myself and I had my first business when I was 21, with 7 employees). It seems there are variables you are not aware of. But we don't have enough info from your posts to really envision the failure/success potential.