OP some great choices here. Please consider Odyssey Audio, Indianapolis, IN.
I've been running the Kismet amp for about a year ... I can't create a scenario where I will ever be rid of it. Simply sublime, built well ... and within your budget.
SS Amp Choices
I presently have a First Watt F8 and was beginning the process of looking at a few Solid State Class AB amps that I could utilize in my system, giving me additional power and flexibility with future speaker choices - running Zu DW 6 Supremes at this time. I would be pairing the amp with my Modwright LS 100. Price wise the range for new/used would be $3 - 4K. My research to date has uncovered the following possibilities - NIB Van Alstine DVA Set 500, NIB Benchmark AHB2, and a lightly used Anthem P2. I have seen a few Pass 150.8 amp offerings but these are top of my range plus for used. I realize there are many choices available and wanted to get some thoughts from this group. Note I will likely keep my F8 as I am attached to it.