intel arc b580 (i think that's the latest one) isn't obnoxiously priced but you're going to have to face the fact that your PCIE is really very slow. But it should work.

if you want to save even more money get the older Arc Battlemage GPUs. I used one it was comparable with an RTX 3060; i returned it because the machine i was running it in had a bug that was fixed 2 days before i returned it but i didn't know that.

I was seriously considering getting a b580 or waiting until the b*70 came out with more memory, although at this point i doubt it will be very affordable considering VRAM prices going up as well. A friend is supposedly going to ship me a few GTX 1080ti cards so i can delay buying newer cards for a bit.