For the smaller tweeter caps, it's hard to beat the V-cap Teflon and it's affordable. .22-1 uFd are recommended. You can get similar results for higher values using the V-cap oil in parallel with a V-cap .22uFd Teflon. See vhaudio.com The Duelunds after break-in are a tiny bit better, but need HF bypass with another cap IME. For the very large values, I try to get non polar Black Gates. Still available on some sites, maybe partsconnexion.com.
Iv'e tried Sonicaps and Jupiters. Jupiters can be very good, but don't survive high temperatures.