Sunfire Classic Vacuum Tube CC - Reverse RIAA

I am running my DAC thru reverse RIAA, and find it to sound more pleasing; more like vinyl / analog. For those of you who have it, are you using the feature? If so, what tubes do you recommend? From what I understand it uses 2 12AX7's and 1 6922 for the Reverse RIAA section. I'm thinking of trying EH (Electro-Harmonix). Also, one other tweak I am in need of is a pair of good short RCA jumpers; my ic's are one meter - too long. Suggestions appreciated.