if u're rich u can get a keeley compressor. strangely i've heard & tried one b4... not sure if it's that specific one, but it does color ur tone. in a nice way though! it does sound substantially different from say, a Boss CS3.
if what randolf claims to mod is true, maybe you can go try out his Dyna/Ross comp mod for CS3 too.
Chorus - u can try the Boss Super Chorus. It's not those natural sounding chorus as the amount of Chorus as u turn it up it very close to the flanging range. Personally I like it better than milder sounding chorus effects.