What's the Best Speakers use with the CAT JL2/SL1?

System : Amps/Preamp: Convergent Audio Technologie JL2/SL1 ultimate, Turntable/Arm: Simon Yorke S7 with Graham 2.2, Cartridge: Benz Micro Ruby 2/Lyra Helikon, Phono cables: Graham IC-70/Cardas Golden reference, Interconnects/Speakers cables: Cardas Golden reference,
CD Player: Audio Aero Capitole, Tuner: Sequerra FM Reference.
What is the best Speakers to use with this system equipment?
My room size: 18ft x 13ft x 8.5ft.

Thanks.
Razen.