Welcome Will!
Yeah, the PRS amp line is a little sparse right now, and the COVID-induced increase in demand for gear has hit the used market pretty hard as well. Used to be you could find several crazy good deals on used, USA made PRS amps. Right now they’re fewer in number and going for a lot more, usually.
I wouldn’t buy a Sonzera without trying it. I’ve played one a few times, and just can’t get a good driven sound out of it, but then I hear other guys playing them (especially Strat players) and they sound AMAZING. Not sure if it’s because they’re cranked up or what. The MT15 and Archon - I think you’ll know if it’s your kind of thing or not pretty quickly, and it may be a little much on the gain based on your current amps. The DG30 I’ve not tried, but hear it’s amazing, if you want to spend that much. It’s an amalgam of David Grissom’s favorite things about vintage amps and has a classic Americana kind of vibe to it.
Sweetwater currently has a small stock of new, limited run Sweet 16 heads, which that amp was in normal production about 10 years ago. I got one, it’s cool and may interest you. It’s based on the older version, but updated to reflect some of the more recent things Paul learned about his favorite blackface amps. My experience is, it’s like a blackface Deluxe but has a gain control, and is optimized for dirty tones rather than clean. It can do clean, but shines with crunchy tones, it has lots of gain available, in a vintage voicing. I swapped out the V1 12ax7 for a 12ay7 to significantly cut the amount of gain down, and that’s really a sweet spot. They’ve also dropped the price on those recently, it’s a pretty nice deal on a USA made amp.
If you go used, the HXDA is a righteous recreation of a plexi, or rather two, one that was Duane Allman’s and one that was Hendrix’s, they were very close in spec, the HXDA has switches to toggle between the components that were different between their amps.
There are 2 Channel C and H, and Custom 20/50, the Customs being a tricked out version of the 2 Channel amps, adding presence and depth controls, lead boost, mid voicing options on the lead channel. I have a Custom 50. The clean is in the ballpark of a Super Reverb, the lead channel is its own thing, it has a nice mid push but fatter than a classic Marshall circuit, not fizzy, and if you don’t go crazy with the gain, it allows a lot of character to come through from anything you boost it with. Really cool amp. The C’s and H’s are cool too, but the Customs are a more polished and versatile evolution of the amp.
There are some other very good PRS amps, but I think these are the most common ones.