phono/preamp analog front end

I have a great, older  analog system...Oracle/Graham 1.5t Ceramic/Ortofon A95/Classe DR-6(modified/refurbished)/Threshold 4000 (modified)/Von Schweikert VR4.5 Silver with all nice power cords/interconnects.....considering upgrading preamp...used vs  new, looking to spend about $5K....could stick with SS, get used Pass Labs XP-15/X2.5 for <$5k....never ventured into tubes.....no convenient stores for me to go to....any thoughts?