Amplifiers weight


What does amplifiers weight has to do with performance?
im trying to decide between this 3 amps
parasound JC5 73 pounds, Anthem STR 60 pounds Michi S5 by Rotel 132 pounds 
I can get them around the same price 
my speakers is modified klipsch KLF 30
preamp is Michi P5 and a pair of SVS SB16 ultra Sony Hap Z1 and Cambridge Azur 851N
i really like the looks of STR amp 
lordrootman
Glad three people got on here to post Nelson Pass' thoughts on the matter.  +1, +1, +1.
Do you like your current amp the JC1?  Are you keeping it?  If yes, buy the Anthem.  If not, then why change horses?  Ie, buy the Parasound JC5.  I have the Parasound C2 pre and love it.  I'm now using a DAC Maraschino 60 volt amp, beats my 50 to 70 lb hi current amps in every way.
lordrootman:  Now you have me intrigued.  I bought the Parasound A21 because I thought it was just beautiful with the top panel removed (specs were good too, but it was the looks that got me).  Now I have to check out that Anthem STR you are drooling over!