It really depends what sort of music you do, dance,techno, breakbeat, rock, pop etc - all have complementary synths for the job.
If its an all rounder, then the JV is your bag but...I would go via the wavestation, but only an expanded ex, ad or (sr version if you cant be bothered programming). The original misses out on the various wavetables that were included on later models. Pads are very important, sure folks go on about bass but when you hear a lush swirling pad, there is nothing better for playing satisfaction. You could always get a cheap monophonic unit for bass, which will give you more sound for your money and will most likely products you will keep unlike the JV, which is a workstation sort of thing.
The Wavestation plays one patch at a time, but the richness is great. . The wavestation also has fantastic effects onboard, so go for that, you wont be sorry.