I just found a 6,1 3.5 with D300s, 12GB and a 1TB drive for $600 across town. It's obviously an old machine, since the six core could apparently only be configured with the D300s for a short time. I have been holding out for a beefed up Mini, but this seems like a somewhat reasonable upgrade from my old 4,1. I hadn't really looked at them much, because the pricing was so high, but this seems entirely more reasonable. The D300s are obviously pathetic, even more so than my dinosaur 7950, but they can be run together in windows, can't they? I just looked for external GPUs, with predictably hopeless results, are the D300s that much worse than an M1, especially in Win?