I'm happy but I want more, more, more

My system is a Clearaudio Performance SE table, Clearaudio Stradivari cartridge, ARC PH5, Conrad Johnson et3 se pre, and a Classe CA-2200 amp running a pair of Thiel 3.6. Speaker cables are Cardas Golden Cross and interconnects are Cardas Clear Refection. Now, to upgrade the pre to a Conrad Johnson ACT 2 series 2 or an ARC Ref 3 will cost me about $3500-4000 CAD, as will an upgrade to a ARC PH-8 phonostage. Any opinions regarding which upgrade, pre or phonostage, will yield the greatest jump in performance are appreciated. BTW, no talk about upgrading speakers and leaving Thiel as that costs real money and countless therapy sessions.