Timm and Gordon,thanks for your comments.
BTW, I went back to dealer today, I've told by one of sals rep, he gives me three options:
1, NAD C165 Preamp and NAD C275 amp around $2,100. (I don't know too much about NAD).
2, Rotel RC-1580 preamp and Rotel RB-1582 amp about $2,800.
3, Music...