I have a Leben CS600 and want to get some better phones. But I'd like to avoid the hassle and expense of returning and paying restocking fees if I don't like the match. Perhaps there are some Head-fiers in the Washington DC area with Audeze LCD2, Beyer T1, Senn HD800, Grado GS1000 or AKG701/702 who would like to hear the Leben and in turn let me hear their phones? (After reading comments on the CS300, I'd be particularly keen to hear the LCD2s.) I have a variety of power tubes to play with: SED EL34, Genelex KT77, Russian NOS 6P3S-e, Sovtek 5881.