EVGA GTX1650 = $140 after MIR
There's little point in going with a 1650 when a 1650 SUPER is close to 40% faster for a similar price. The only real reason to go with the original 1650 (non-SUPER) would be for a pre-built system with a low-end power supply that couldn't handle a graphics card drawing over 75 watts.
I do notice that stock of those cards seems to be rather low at the moment though, with only some single-fan models readily available in this price range, which I'm guessing is why you went with that. It's probably worth keeping an eye on 1650 SUPERs to see if they come back in stock before buying though. The single fan ones would work fine as well, but might be more audible under load...
https://pcpartpicker.com/products/video-card/#sort=price&c=476
Is there any major drawbacks, going with a used GPU, Is this something that is advisable?
It's an option, but you generally won't be getting proper warranty coverage, whereas new cards will include a 2 to 3 year warranty. The RX 480 is also a little bit older, and can draw around double the power of a 1650 SUPER, potenitally getting up around 200 watts when under load, and in turn will put out more heat, while generally offering a similar level of performance.
You might also consider buying a brand new RX 570, which can be had for as little as $120 at this time, and generally performs only around 10-15% behind those other cards, but still around 10-15% faster than the 1650 (non-SUPER). It's power draw and heat output under load can get relatively high as well though...
https://pcpartpicker.com/products/video-card/#sort=price&c=392