Hello
maybe is just me .. but i get more and more pleasure with real time
synths, simply laid out panels and immidiate tweaking
http://www.mfberlin.de/Produkte/Musikelektronik/MFB-SYNTH/mfb-synth.html
or a waldorf pulse with some knobby box
can make miracles
u can chain them also if u want polyphony
i also love the doepfer ms404 if u can find one
all mono analogue ..depends also what kind of sonority
u are after
also cheap nowdays are jd990/k2000/Ws/UWave/TG77/Sy99
ciao
Andrea