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Guys like Willis and Bonderman have horrendous mechanics. Webb as well. Bedard obviously throws a high risk curve and is plagued with injury problems in his career.
Felix is near picture perfect. The mechanics, the youth, the arm. Hes one of those rare pitchers like Verlander or Lincecum who I wouldn't worry too much about arm troubles at least until their mid to late 30s.
I'd give Felix 7 or 8 years ($110-130mil) and I wouldn't blink. Felix just had a 7 WARish season (worth $31+mil in last years FA market) and there may be several more seasons like that left in him. Hes not replacable in any way and is likely going to be well worth the investment.