I had asked this exact same question just before Christmas. We wound up getting the Horizon E700 (which was reccomended) and we LOVE it. Both my husband and I are very tall and we needed one with a longer stride length (this one has an 18 inch stide length). You will definately want to go to a store and try them all out. Depending on your leg length, some will feel really choppy while others will just feel natural. I think we tried out at least 10 or so before we purchased one. We wound up getting ours at Dicks Sporting Goods because they were running a great sale at that time.
Good Luck in your search!