Audio Research pre amp question

I'm about to venture into tubes for the first time. I have decided after trying out a AR VT 100 MKIII, that I am ready to give it a go. Even though I was using my exsisting solid state pre amp I still felt the thrill. I put on a Suzanne Ciani & the piano sounded so real. I have played this CD possible a hundered times & it was as if I was hearing it for the first time.

My question is which AR pre? I've read about the LS MKI, LS MII ( I understand a new tube is used) & the RM 25 MKII. The Reference 2 is not a consideration, not in the budget.

Some of my thoughts: Will the LS Mark II give me 80% of what the RM 25 MKII can do? Is the RM 25 MKII the only way to go if it in the budget? Does listening preferences dictate which unit to consider? Just don't know enough about these to make a decision.

Here's personal info: I listen to a lot of female vocals, blues, classic rock, country when I feel like it & a few specific jazz artist.

If you have any first hand experience with any of the AR pre's matched up with AR amps please share your knowledge.

Thanks,

Ron