If you are in the U.S. you should list the lowest prices you have found for each GPU series from reputable sellers. Because the last time I did here is what I found. (All observations are based on buying a GPU NIB with warranty in the U.S.)
The 1650 is still above launch MSRP over 3yrs later. The LP versions are stupidly overpriced, making them a terrible value for tiny builds.
The 1630 is hilariously overpriced and I only found it at 2 sellers I'd trust.
RX 6500XT is the best deal for under $200 right now.
RTX 3050 is overpriced, and as
@VirtualLarry has pointed out, even the 12GB 2060 can be bought for the same money. Making the 3050 a terrible choice at anything above $250. Even then I would not pick it for gaming over a RX 6600. Only if NVENC was the killer app for my use case.
The RX 6400 is the king of tiny builds. There are single slot LP versions like the one I picked up on Amazon Day for $117.50 and it came with the new Saints Row game, a $40-$60 value = good deal. Usually they are $150-$170 Saints Row still included. For anyone planning to play anyways, that brings the price down to closer to what a card like this should cost. Still overpriced for the full sized version though.
The lack of media block on the RX falls flat for me. It only loses the old Optiplex type builds, which it is too expensive to be considering anyways, given the used market is not full derp anymore. For a ultra budget build, pair it with a i3 12100 and let it do all the media duties.
All that out of the way, I agree they are all bad values now due to the used market improving drastically. With the exception of the 6400 single slot for modern tiny builds. There is nothing that can touch it at the moment, for those.
On buying used: All the reviewers still suggesting Polaris or cards as old as the 1060 6GB can get rekt. They are out of touch with reality. Those cards are on the wrong end of the bathtub curve/cradle to grave of the product. Many could be former mining slaves.
But as
@DeathReborn pointed out, there are cards like the 1650 Super and RX5500 under $200 again. Even if the 5500 8GB did some mining, it is still on the good side of the curve. And both make much more sense than the 6500XT for PCIE 3.0 use like in an old Optiplex. There are other newer used cards intruding on the space here and there now too.
My conclusion is only the 6400 LP single slot, like I picked up, is worthwhile. Everything else has been overtaken by the used market again, FINALLY.