I was on the MarkBass site and noticed a bewildering array of bass heads , 18 or so, and was wondering if anyone uses heads like the TSA 500, the LMRocker,the R500, TA501,503, SA450, etc. ? I realize some have been discontinued, but its eems like, at least here on TB, it's all about the LM III, or F500. Anyone use these other MB heads that don't get discussed too much here ? I have tried the SD1200, the LMII, F1, and TA501. The F1 was my fave so far.