The Lounge Lizard VST and the MODX sound best. But I'd recommend geting a copy of DEXED, which is a free VST that perfectly emlates a DX7. It reads DX7 SysEx files, so you can get the original patches in a SysEx file (also for free) and you'll have a perfect DX7 EP--not a sample, a real FM piano that works and sounds just like a DX7.
The Lounge Lizard VST and the MODX sound best. But I'd recommend geting a copy of DEXED, which is a free VST that perfectly emlates a DX7. It reads DX7 SysEx files, so you can get the original patches in a SysEx file (also for free) and you'll have a perfect DX7 EP--not a sample, a real FM piano that works and sounds just like a DX7.