I like the way my ProAc Tablette 50 Signatures sound with my Simaudio Moon I-5. A much bigger sound than I anticipated. Since the Plinius 8150 has more power I would recommend the ProAc Response 2. If you have no objection to purchasing a used set of speakers, they can be found here in the classifieds for about $1300. Better bass than the smaller ProAcs but also a manageable size.
Good luck!
Good luck!