This thread is turning into "must-have" options or "S vs Base".  
 
If it's all about "must-have", 
Forget 18/19, 17 is fine. Forget Bose, Xenon, Full Leather, PASM. Forget S too. 
There is no such a thing like "must-have". 
Base Boxster with no options is the best value.
If it is about "recommendations",
No doubt I'd get PASM & Sport Chrono over 19".
I just saw eslai's post below, very good reviewer on options.
Check out his other thread about options too.