Need your help for pre-amp

Hi,

I need your help to choose a preamp.

My system:

CD: Pioneer PD65
AMP: Luxman MB3045 Mono
Speaker: Sony SS-M7
Cable; Vand Den Hul: Inter: The first
Speaker: CS-122
I like a huge soundstage, open and perfectly focus.

For around 1700$, what do you think about Cello Pallett, Berning TF-10, Adcom GFP-750, Convergent Audio SL1 ?
Please, let me know your idea.

Thanks

MB