I'd definitely stick with the Classe amps over the BAT gear you reference. I've owned BAT VK200 amp paired with VK30 preamp & found the two pcs to be over-rated in comparison to other gear in their class.
Not sure what your budget is for a preamp, or what your trying to achieve from a sound perspective. I like my Aesthetix Calypso ($2700 used with stock tubes), but it really needs pricey NOS tubes to sound it's best... so assume a $3,500 total investment.
If your interested in unloading the seperates and simplifying with an intgrated amp you have many good choices... I'd recommend a tube or hybrid integrated (Cary SLI 80, Pathos TT or Classic, VAC Avatar SE or Super, BAT 300SE, Unison, Cayin, Conrad Johnson). Spend your left over money on upgrading power cords, interconnects and speaker cables.