Since no one else has responded, I'll try. I am not sure what sound you are after based your desire for both "accurate, detail speed and resolution" and that you "like the warm tube texture". These pre-amps are very different in sound. One of the best reviews of the XP20 I've read (and I owned one for awhile) is this one:
http://www.hometheaterhifi.com/preamplifiers/1351-pass-labs-xp-20-stereo-preamplifier.html?start=4
The last sentence is the most important one - "Tube aficianados would probably not like this preamp". I agree and maybe you would not like it as much as your MW. The reviewer clearly says elsewhere that he prefers both tubes and solid state in his sytem and is sounds like you do too. You will get better bass and more detail with the XP-20.
Interestingly the XP-30 is reviewed in the same on-line magazine and it apparently sounds very different from the XP-20 and it is recommended with solid state amps - maybe that would work for you. Also, I'm wondering whether you might get better results upgrading your amp instead to an XA 100.5. I would read others review of making that change here and on other sites. Good luck.
http://www.hometheaterhifi.com/preamplifiers/1351-pass-labs-xp-20-stereo-preamplifier.html?start=4
The last sentence is the most important one - "Tube aficianados would probably not like this preamp". I agree and maybe you would not like it as much as your MW. The reviewer clearly says elsewhere that he prefers both tubes and solid state in his sytem and is sounds like you do too. You will get better bass and more detail with the XP-20.
Interestingly the XP-30 is reviewed in the same on-line magazine and it apparently sounds very different from the XP-20 and it is recommended with solid state amps - maybe that would work for you. Also, I'm wondering whether you might get better results upgrading your amp instead to an XA 100.5. I would read others review of making that change here and on other sites. Good luck.