The RNC 1773 (especially in Nice mode) doesn't really have much of a sound of its own. Some may say it not only is boring as a comp, but it also sounds a bit dull. Well, definitely not a sound machine, but very OK as a cheap general comp. However, I found it is not so good for taming bass-heavy electronic program material and is also not good at all for treating transient overshoots.
SSL comp indeed is a good one should you decide to build. The GSSL vanilla is a classic not only in hiphop. Also good because it is somewhat customisable, especially if you skip on fancy pushbutton switches, expensive metre and prefabricated faceplate -- and instead drill/paint your own
For electronic music I'd recommend pots for ATT and REL instead of fixed values on rotaries. Also, there's a quasi-feedforward mod and a 1.5:1 RAT mod. As for sidechain filtering, one could try and stick a (cheap Chinese) tone-board into the sidechain as a quick approximation to all the tilts, slants and smiley curves anyone could ever possibly need.