Hi. I have a budget of up to $4k on an amplifier. Looked at the McIntosh MA6300 integrated. Is that really the best unit for that price? Should I consider pre + power amp? How about tubes? I've heard you can't get a a decent tube for that price. Please chime in guys - it's confusing out there. What about used?

Here's my current gear:

Vandersteen 2CE Signature loudspeakers

Rega RP-1 TT

Kenwood VR-207 amp (to be replaced)

Thanks again!