You might want to make out a list of the features of your future preamp that you really want, so you can narrow down your choice.
I mention this because the Lamm preamps do not come with a remote control. (Obviously I am not a critic of Lamm products, given that I own their amps, but I'm merely pointing out that some (most?) people really want a remote control for their preamp - I know it was on my "must have" list of features.) Now sonically, the Lamm preamps are excellent. (I think they have just a touch of darkness to them, as do my Lamm amps actually, but they are very, very musical.) In addition, note that the Lamm preamps are actually not fully balanced, but are in fact pseudo balanced, (unlike their amps which are fully balanced).
You might also want to consider some of the Audio Research preamps, as they are fully balanced and have loads of features as well. (Their Ref. 3 preamp was on my short list as it is very good, and their Ref. 5 preamp is incredible!)
If you're looking to avoid tube rolling, (although I recommend against that actually), I would look into the BAT SE preamps, as well as the later ARC Reference preamps, as they use the extemely quiet and very neutral 6H30 super tubes, which you can't really tube roll, as there is only manufacturer, (to the best of my knowledge). BTW, Victor Khomenko, of BAT fame, is a really nice guy to work with, and will gladly answer all of your questions regarding his products.
Again, Good Luck in your search!