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I've never heard Korg's R3, but the jx-3p is a great, cheap analog poly, and the programming interface without the pg is ok (you'll remember the parameter's numbers faster than you think). Of course, controls are coarse, it doesn't have a dedicated filter/pitch eg, the filter looses body as resonance is increased, and the oscillator's design shows its rudimentary digital nature when sync/ring mod are activated (still better than not), but it can make some very nice sounds, with a definitive analog presence (it'll probably perform much better than your R3 in the bass register, even though its overall tone is more in the mid-range !) 300$ seems ok to me, if it's in good shape.
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