The latest version of Behringer's Composer dynamics processor appears to provide all the facilities anyone could ask for, with a separate expander/gate, compressor and limiter for each of its two channels.
The DDP takes the five dynamics processes you're most likely to want, turns them digital, and squashes them into a 1U studio workhorse box for under £600.
Can new technology really emulate vintage equipment, or do you have to use vintage parts? Paul White test a modern compressor that claims chameleon-like abilities to emulate classic compression sounds.