I really love the RND compressor in the Portico. A stereo unit is about $1800, but you can find them used on E-bay for $1200. Having a high quality stereo eq to go in as well as mix through is a really nice thing. Nothing quite like analog compression. The RND has feed forward as well as feed back modes, for a more modern sound or old style compression. Top notch unit.
My other suggestion is over budget, but Rupert Neve Designs. He's making his old designs again - the Shelfeld series. The man who originally designed the 1073 Neve preamp redoes his classic, as well as an inductor EQ and compressor in a single unit. Couldn't use it for mastering unless you are doing mono, but coming after your A design would be sweet. He's just brought them out, so I haven't heard them. Supposedly run on big rails like the Portico II w/ plenty of volts. We'll see. Another good thing is, after spending $3000, you won't lose much on resale. If you ever want to get rid of it, that is.
Finally, a nice hardware reverb/effects unit. Again, I can hear a difference. Sublte, but there. Those are all over the place, price wise, but something w/ Eventide stamped on it is better than anything you'll get inside a computer.
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