Amplifier for Harbeth 40.2

Hi,

I have Harebeth 40.2 speakers and looking for thoughts on amplification for them.

Currently I use the pass labs int-250 and like it but feel could be improved upon.

One recommendation was given by dealer was to go to separates and pass labs 350.8.  That would improve bass further but not sure would improve midrange where previous VAC integrated had advtg over Pass.

Another recommendation was Luxman 900u amp.  This probably gives me midrange improvement but seems less powered than pass pas int 250 and def far less than 350.8.

Michael