Nomad audio runs a lot of specials - don't know what the cost is at the moment but it is worth waiting for it to drop to $99 or whatever. It does add a tone or scrim or film to the sound if that is what you are after - some people like it and would say tone, others don't and call it a film. In my work it has a place. What is really nice are the delays and such in the entire kit. I use them all the time.
The Prochannel EQs in SP are very good - that might be the way to go. Not as dark and thick as the Nomad, but they seem more dynamic, in that the harder you drive them the more they seem to thicken up. Nomad is more of a steady state tube effect. You might be able to get away w/ just buying their blue channel strip.
And yes, outboard, analog gear will have a more cogent effect on the sound than most plugs, tho I know some pros who claim that UAD is close enough.
Pick your poison and open your wallet. Nobody can tell you what you hear, it will be a matter or your artisic sensiblities. You might want to check out some pro studios w/ different options, tho what you hear over big montiors in a treated room might not translate as well at home.
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