I'm not familiar with the specific Threshold on your list but I'm a serious Threshold fan. I have SA-200 monoblocks. After 20 years of use one of my cats decided to pee on one of them. I bundled both up and sent them to Threshold for them to look at and refresh. They told me that one of the amps was slightly out of spec. Not bad for 20 years of use.
I've seen SA-200s offered for sale but I have no idea if any are currently available, or at what price. When I looked (just out of curiosity) a few years ago, purchasing a pair and sending them to Threshold for whatever needed to be done would fit in your budget. Outstanding amps. And they were in the Pass era.
I also have FET-10 pre-amps. If you stumble across someone who's selling both, consider it if you can fit it in your budget.
Good luck and have a great Thanksgiving.