You need to know how and for what you want to use the bike.
Before saying what bike is better than another.
And what is most important for you.
Most bikes are good for some reason/usage.
Will you ride only on mainly tarmac roads? And good gravel roads?
=> Street bike OK ? (A lot of 160 cc "street bikes" are used by locals in hard environment)
How much luggage do you plan to carry? Camping equipment ?
In general
Colombia has import taxes based on cc. Everything over 200 cc is much more expensive. But... Royal Enfield is assembled in Colombia, and is not affect of this => Good value for the money. But still over your budget.
What bike ?
Street bike is cheapest. I thrust TVS (Indian) more than AKT. And AKT is Colombia specific. (From China) More problems to get parts outside of Colombia.
Do you need a luggage rack with cases ? => For camping equipment?
Or are soft bags, rack less OK. Type Mosko Moto ? (Not cheap)
Or a big bag on the seat, tank bag and.... ?
Everything can be solved if you have equipment and time. I have seen many home made racks on Honda XR models. But if you want something from the store ?
In the end I had Honda XR 190L and RE Himalyan as contenders.
My choice was RE. Because I could buy that one with hard panniers and top case. And that was important for me.
With no need to bring camping equipment. I would have chosen Honda XR 190L. Or maybe even a XR 150L. To get a simple and reliable bike. Produced by Honda in Brasil. So no stranger in SA.
Honda has a bike named CG 160 Cargo. With a rack over the pillion seat. Useful
https://www.honda.com.br/motos/street/city/cg-160-cargo
But I have not seen that imported to Colombia.
Two Colombian friends use Honda XRE 300. Best travel bike for SA according to them. But it is expensive. And have a rather high seat (for me)
Kirk Wilson was touring SA. 20 000 miles. 5 month. On a TVS 160 cc street bike.
XR 150L might be a good compromise.
That fits in your budget.
But you are the one going to use the bike. So buy what fits you.
But. Your cost will not be the price you buy it for. But the difference between what you pay for the bike and what you can sell it for......
I have attached a picture with bike information
=
When it comes to Spanish and buying...
Here is my view on this:
If you buy a bike from a dealer. He should be able to speak English and help you with RUNT. And the transfer of ownership....
If it is new. No issue. But if it used. He should do the checks of the bike
You would need to be rather good in Spanish language and also in Colombian rules to buy a used bike from a private person.
The history of the bike has to be checked. All kinds of fines follows the bike, not the rider. Mechanical inspection should have been done. SOAT payed...
Synch of money transfer with owner transfer......