I like both my Leben and Liquid Fire for the LCD3, but for pop music I prefer the Liquid Fire. The Leben, however, still exhibits the extra smoothness and tube euphonics when compared with the LF which is more powerful, and therefore the Leben is my preferred amp when it comes to acoustic / vocal. If you use the LF with LCD3, beware - you need to tune it in a way such that your cables and tubes matches the relatively warm signature of the LCD3. If you use sweet tubes the LCD3 may just sound too thick. Try using some silver headphone cable for the LCD3 and the Telefunken CCa tubes, although they are much harder to find than the Siemens CCas. For Leben, I recommend Amperex Bugleboy 12AX7's and Mullard BXA date code EL84's. They really make the LCDs sing. If you prefer a tad warmer sound, replace the Amperex 12AX7's with Sylvannia's. Very good quality as well.
Speaking of SS amps, I would like to try the Accuphase C3800 again once of these days. Last time I tried it with the LCD2, it was amazing, so very eager to try it with the 3. For tube amps, the EAR HP4 is high on my list for auditioning but it doesn't look like I can try it out anywhere in Hong Kong. I saw one selling on Review33 months ago and now regret not getting it back then.