I finally bought a knife. I went to the Kitchen Supply District (Jujuy b/n San Juan & Juan de Garay) and went into a place on the corner of Jujuy & San Juan (SW corner). They had some knives on the wall near the counter, they had some knives on some racks by the lockers by the door, they had a few more knives... They weren't looking to help, it looked like they focused on plate wear and some other stuff...
Then I went across the street to the SE corner and they didn't have any chef's knives, but the guy told me to go next door. (Todo Bazar, Jujuy 1214) I did and this is where I ultimately bought my knife (knives).
For a chef's knife, I went with this one:
Mundial 5100 Series 8-Inch Chef's Knife, Black
Amazon Link
Amazon says that it lists in the USA for US$51.00 (AR$189-ish), but Amazon offers it for US$40.80 (AR$151-ish) with FREE SHIPPING. But I bought mine today for AR$113.40 (US$30.50-ish). No waiting for someone to come in from the States.
8" vs 10"
I felt the 8" and the 10" and I could see wanting the 10" in the future if I start cutting enough things that I feel are too big (large potatoes into fries, large squash), but for now I think I would go with something that just felt better.
The salesman did a good sales job and I ended up buying one of those metal sharpening rods (AR$40 = US$11.10-ish today at the bank) which I'm not positive I needed. But I had him sharpen up my knife on it before I left the store and I was planning on buying some other knife at a different place and then paying AR$22 to have that done. And watching him struggle a bit to sharpen it and then do it some more when it didn't cut the paper as well (he shreds some receipt paper for his sales demonstration), was good to see. I now know it takes more than the effort that it takes to brush dog hair off your coat.
I ended up buying a 2 1/2" paring knife as well:
Mundial 5100 Series 2 1/2-Inch Peeling Knife, Black
Amazon Link
So that I'll have a paring knife to peel my apples with when I make some apple chutney in a few weeks.
I'm pretty excited that even with having to pay 5% more for using a credit card, I still only paid AR$219.00 for all 3 items. (US$59-ish) I might have been able to haggle and not paid the 5% because I was buying three items, but I forgot to think about it.