My highest mountain so far is Mt. Whitney at 14,498 ft / 4,419 m. It was also one of the easiest. Hardest is probably Mt. Shasta (via West Face)... it was not technically hard but just a neverending snow slope with over 7K' gain from the trailhead.
Personal goals include Rainier, Elbrus (just like you Diego) and Ama Dablam. My dad climbed Elbrus 6 times, and plans to climb it again next summer. Perhaps, I will join him on that trip... Ama Dablam will have to wait until I quit my job and have at least 1-2 months of vacation time