$20K or under? You have a lot of options. Great amp/preamp, by the way.
Give us some specifics--room size, music genre preferences, source you will use, cabling, speakers you've heard and liked--and we can start spending your money for you. :-)
Give us some specifics--room size, music genre preferences, source you will use, cabling, speakers you've heard and liked--and we can start spending your money for you. :-)