I have about $4000, what's the best setup to get?

Ideally I'd like to be able to run Qwen 3.8-Flash-Next with decent performance.

I was thinking of just buying 2x Radeon AI R9700 (64GB VRAM), or maybe a DGX Spark but that was before the price hike. My brother suggested just getting a Strix Halo box with 128GB unified.

I did see I could buy 6x Intel Arc B60 (24GB each, 144GB VRAM Total), but researching seems like the performance of the B60 is lacking. I'd also need a new v motherboard/CPU that can run 6 GPUs.

I'm also not opposed to getting a Mac Mini or Studio if the price and performance is right.

The $4000 is not exactly a hard cap, like I could stretch to $4200 without too much struggle, but obviously the cheaper the better. I'm lucky to have a decent stock pile of NVMEs and DDR4/DDR5 UDIMMs, so if I need to build a box, I could, would just need the motherboard and a CPU if I can't just slot in either the Intel 14700K or Ryzen 9700x I already have.

So where am I swiping my credit card?

Edit: This is a use it or lose it budget from my work, can't really save it.