What 2 channel Amp would you Buy for $6k?

For less than that I can sell you my Line Magnetic 219ia. Mint condition, gorgeous sound. Magnificent amplifier, just not what fits me best, it's a shame...

My opinion: Get a Decware Zen Triode $1300 + invest the other $4700. YMMV

If I had the money and space, these:

https://www.audiogon.com/listings/tube-mono-amps-w-c1-teflon-cap-upgrade-l-k-2017-10-30-amplifiers?a...

OP….

Congrats on the 501s!!!

Although my ‘take’ on them and your own differs somewhat, I read you are well pleased. That’s great.
I honestly felt they were the more ttransparent of the two listening to them on Mac Speakers. More lively. A tick less colorful than the Big 602 which was IMHO a very good amp.. therefore, didn’t think on 802s it was the best possible fit.

Glad it turned out otherwise in your outfit.

Listen long and prosper.

I'd buy four more Inspire Fire Bottle amps and hoard them.