Donnie's pads are indeed sick.. I couldn't tell you exactly how to achieve the sounds but Dave Owen's sounds are usually sampled.. the pad in the tune you posted im guessing is just a sample with an lfo on a low pass filter. < Don't quote me on that tho, he may well have used a synthesizer for the pad. I too would love to know which synths can produce these smooth as fuck sounds though
Yes, Rhodes modulated.
If have Reason you can do this in 2 click of mouse plus Midi keyboard by loading NN19 with Rhodes patch or a B4 organ and effect it.
If not on Reason, look for AAS Lounge Lizard Vsti on google or watch this video: http://youtu.be/r8x5mz7yffY
It's my favourite plug to pick up when I need a classic sound like this.
I wouldnt rely on sample packs for pads really. You'll be far too limited. Any synth with 3 oscillators is capable of producing these types of sounds, although if I had to choose a couple, I'd go with Rob Papen's Predator, or NI Absynth. Just experiment with different waveforms, have one set +5 semitones, one set at 0 and the 3rd at -7 semitones, this essentially produces a chord. Then play with the ADSR envelopes, with a nice slow attack and release. Add chorus, reverb delay etc etc.
Use a synth with just a simple sine wave osc... the key is the attack and release envelopes.. all should be set to fairly high values, say 2-3 seconds
Next up, run it through chorus.. about 40% wet followed by reverb.. you want this to be fairly wet too about 60% with a long decay.
You can add modulation in terms of having notch filters (within the synth itself or in the FX chain) tied to a slow LFO... or you can try more complex wave forms in the OSC.. this should get you started though.