Rack preamp opinions wanted

looking for some opinions guys.
Ive recently gotten really hard back into playing.
Im in the process of having my 5150II modded so it has a usable clean channel and possibly take away some of the gain on the lead channel since i only ever go to about 6 on the dial, in order to have more ability to fine tune my tone.
What im also looking at doing is building another rack amp. Ive got an SKB Rack case 8 space that ive had for a number of years with a
Mesa Boogie 2:Ninety Power Amp sitting in it. the power amp needs new tubes but is only 7 years old and ive owned it since new.
I use to run an ADA MP1 and Marshall JMP-1 with a midi controller foot pedal with it as well as a BBE Sonic Maximizer and Furman Rack Conditioner. I liked the tone but there always seemed to be something lacking in the equation. I never did the tube mods for the MP1 or JMP1 because i didnt know about them at the time i owned the amps.
Im not quite sure whats out there for used pre amps and what sounds good.
I have thought about selling the mesa and getting a vetta II line 6, but im not sure i would like it. i really want something with LOTS of versatility for this amp.
Ive recently gotten really hard back into playing.
Im in the process of having my 5150II modded so it has a usable clean channel and possibly take away some of the gain on the lead channel since i only ever go to about 6 on the dial, in order to have more ability to fine tune my tone.
What im also looking at doing is building another rack amp. Ive got an SKB Rack case 8 space that ive had for a number of years with a
Mesa Boogie 2:Ninety Power Amp sitting in it. the power amp needs new tubes but is only 7 years old and ive owned it since new.
I use to run an ADA MP1 and Marshall JMP-1 with a midi controller foot pedal with it as well as a BBE Sonic Maximizer and Furman Rack Conditioner. I liked the tone but there always seemed to be something lacking in the equation. I never did the tube mods for the MP1 or JMP1 because i didnt know about them at the time i owned the amps.
Im not quite sure whats out there for used pre amps and what sounds good.
I have thought about selling the mesa and getting a vetta II line 6, but im not sure i would like it. i really want something with LOTS of versatility for this amp.