Y'all be trippin. A 30-30 PF is much more rare than a 2 way #2C... especially when the Avs have ROR. Without ROR I can see the debate, but as of now the Avs have ROR. Stastny is a good player at this point, but he is just a solid #2C that is on the edge of declining (I'd debate that he is). Iggy has already declined but is still a solid 1st line PF that can still pot 30g a season. That is still a top 20 goal scorer in the NHL. Yeah he doesn't provide much defensively, but he is physical, stands up for his teammates, and scores goals. On a team that still debatably has 3 top 6 centers after Stastny... Iggy is the better fit.
Years 4-6 would hurt the Avs on a 6x6 contract for Stastny. Year 3 would probably hurt as well, it will be tight with Iggy as it stands.