The Aguilar 925 Preamp is boost only, sounds nice but I prefer the Sadowsky SBP 2 preamp as it also has a volume control (so you can switch between having the preamp on/off with no volume change.
The Aguilar DB 599 is okay for a small footprint comp. One thing I’ve noticed is that at full compression the gain control doesn’t boost the volume back up to unity gain. With the gain on full, at least with my setup, unity is reached with the comp at around 2 O’clock. Any more comp results in a volume drop.
I have loads of compressors, and even though I’m an Analouge fan at heart, the TC Electronic Spectracomp is a firm favourite of mine.. It can be as simple or complex as you want (it has one knob, can use Toneprints and you can edit using a computer if you so desire).