The PSU in the specs you posted above cannot be TXm because TXm doesn't come smaller than 550W and also is gold-rated, whereas the specs you say they suggested are:
450w 80plus psu
350w 80plus psu
Which would be Corsair VS series, if you're lucky.
Corsair VS or similar (a budget-level PSU) would be fine for the system you're building. I didn't suggest Corsair VS specifically, however, as due to the pandemic, pricing and availability of components (especially PSUs) are all over the place and looking at what was on offer online it seemed that the be quiet! one I linked above made more sense if you were going for a budget level PSU. or TXm if you want something better quality and more efficient.
In general the 2 builds that you say the store suggested make a fair amount of sense for certain purposes, but I wouldn't say were the best fits for you. In short because one, while adequate, is relatively low powered for the ballpark price, while the other is really geared heavily to gaming.
I think rather than discussing every possible alternative component to the ones in the spec I posted above, it might make more sense to talk about how that fits your needs and what the pros/cons of alternatives are.
If you look through a load of different builds and we end up comparing every single other component, one by one, we'll end up with conversations like:
"R5 3600 is a great all around CPU that should be futureproof"
"What about R3 3300x"
"Fine, but fewer cores make it less versatile and the overall savings don't seem worth it to me, especially as you keep PCs for a very long time"
"But the R3 3100 is cheaper and similar to the 3300x - would that be worth it?"
"The 3100 is built a bit differently to the 3300x which can hurt performance in some tasks, including gaming which you said you may dabble in"
"What about the 3400G?"
"That's built on an older architecture, is slower, has fewer cores, and tends to be relatively expensive"
"The 3200G looks cheaper"
"That lacks multithreading so is less capable in some tasks - given you keep PCs for 10 years
"So what about the Intel i5 10400"
And so on.
Multiplied by every component.
Which isn't practicable, and won't be very interesting either I reckon!
1) What monitors will you use with the build?
2) What questions do you have about the sort of spec I posted above? If you have specific questions about why X is suitable or whether Y would make more sense instead, it'll be easier to discuss that rather than run through the entire list of AMD CPUs, motherboards, RAM configs, etc.