Mellotronists

I´ve recently acquired a mellotron after lusting after it for many 
years!

It has the infamous CMC10 motor and the original tape frame with flute, 
strings and brass on it. 

After running for about 15 minutes, the pitch becomes pretty stable. 

What do you think I should do in the first place; get a new SMS type 
motor, or buying a new tape set? I want to get the famous choir sound 
and the 3 violins (the octave string section I have sounds quite awful 
when playing chords!) and I can´t decide wheter cello or clarinet.

And where you think I should order the tape set, Streetly or Mellotron 
Archives? I heard that the tapes from MA sound rather "digital", and 
might not work on my old M400. 

Besides, here in Argentina I don´t know of anyone who can service my 
machine... :-(