Spectral amp choice+ Eidolon

Hi,

I live in Thailand and I've been using Meridian508.24+ Spectral amp Dma90(2,Bridging)+Dmc20S2+Mit Oracle cables+Eilodon for a long time. I believed with difficult speakers load and bridging power amp I never really hear what the speakers can do. My room size is 17.4*18*9. I've been using Spectral+Mit all along so I was thinking of upgrading to a new Spectral power amp. I dont wanna spend too much or go beyond Dma200. Please suggest the best choice to bring the best out of Eidolon. My chioces are:
- Dma150 S2
- Dma180 S2
- Dma160s (preferred if this works out)
- Dma200S