To the OP,
Don't forget to factor in retirement benefits into your calculus. During 2004-2007 when UPS was hiring, I know of at least 3 16year plus Captains from USAir and Northwest that left. I know it was a different time, but these experienced pilots cited the retirement benefit at UPS was a lot better than if they stayed as Captains at their respective airlines..I've flown with all 3 of them recently and they said that even in hindsight they're still better off because of the retirement plan. They were all in their early to mid 40's age wise.