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.

Edit 2: To clarify again, this is extra money in the IT budget that we need to burn by the end of the year. Telling me to save it, donate it, invest it, isn't helpful as I can't do that.