Hybrid adjustable-rate mortgages were the ARM of choice for borrowers last year, a new Freddie Mac survey suggests. But ARM borrowers overall saved less money than they have in the past. Reporting on the results of its annual ARM survey, Freddie noted that start rates in 2005 on one-year ARMs rose by 1.0 percent, on an annual basis, while rates on long-term hybrids – those with initial terms of 5 to 10 years …