2,3, and 4 are all quite versatile. 1 is a little less so, but still a very nice looking tie IMO. If limited to one, I would choose either 2 or 3, but which one is best for you depends on what ties you have now and if one fills a gap in your tie wardrobe. I have a brooks tie very similar to 2 that gets a lot of wear, if you don't have much in purple, it can be a very nice color.
Don't love any of them. I'd rank them 3,4,2,1 with the top 2 the only ones I'd wear. Purple is a difficult color, needs to be the right shade to not look cheap and that purple doesn't make the cut.