Digital BW, The Print

The amount of solid information available on this forum is amazing.  But,...but for some of us 
who are not professional or even very advanced amateurs, it can be a daunting task to 
extract what is needed to get a very good print from the means at hand. ( Even for those of 
us who are not techophobes.)

The question of linearization is clearly an important one, one that I'd like to simplify for my 
setup.  So, here's an inquiry that I'd like to get out of the way:

I've purchased QTR for use with  my 2400.  I've installed the profiles included for many of the 
popular paper choices.  If I choose, say, SPR2400 Velvet Fine Art in the Printer Profile (Print 
with Preview), am I assured of a linear response?  Or should I purchase the PrintFixPro 
spectrophotometer kit to do the job?  And does this kit give me everything I need to profile 
any paper I choose?  (I asked a related question, empasizing linearization, of the supplier, 
and he said he'd get back to me with an answer.)

Thanks for your patience.

Harry