New preamp & amp?

I have Tyler Acoustics Linbrook System 2 speakers, an Arcam Alpha 9 CD player, Adcom GFP-750 preamp, Adcom GFA-535 amp and also a Rotel RA-985 integrated amp. I listen to a wide variety of music but mostly to rock. The listening room is roughly 14' x 12 '. I want to move up from the Adcom/Rotel stuff and am looking to spend $2K - $3K. Any suggestions?