Need Preamp and Amp to Match Vandersteen 3A Signature Speakers

I am a neophyte at hifi.   Just bought a pair of Vandersteen 3A signature speakers to replace the JBL l150A speakers that I had for years..   I want to replace the Parasound A23 amp and the Parasound P5 preamp that I currently have with something that will make the Vandersteen speakers perform at their best.     I would like to get a Class A or A/B amp.   I listen to a lot of rock and jazz.   My room is about 16' x 16'.   Can anyone give me some advice what preamp and amp would work best with these speakers.   There is so much info out there and it is very confusing.  I like a rich full sound, not harsh on the high notes.  Also like a rich, well defined base.    Thanks for any advice you can give me!!!