If you are thinking of replacing your gutters, you might want to look into replacing your old gutters with seamless gutters. They are much better because of the lack of seams. They will not leak the way gutters with seams can leak.
As long as you are thinking of going to all the work and expense of replacing gutters, you might as well pay a little more and get the best kind of gutter. This will be a seamless gutter.
The price of a seamless gutter system is not as bad as you would think, considering.
Remember when replacing your gutters to get several estimates, and be sure to do some research about the contractor.