all three are excellent amps. I have owned plinius and musical fideity and heard the lfd. If you are going to keep this amp for a long time, i would buy the lfd....and keep it forever, it is that kind of amp, hard to find used and reasonable, but the plinius is somewhat more powerful in the bottomend than mf....so with the spendor which is bottom end very good i would suggest the mf....money wise and solid amp to use....but again the plinius is excellent...you have a great situation due to all three would do a great job as you probably already know...but my list would be ....lfd to keep, money wise...mf......then plinius,also think plinius will hold up longer and mf....
