The last pair, as they are sleek, and neutral in color; and thus versatile. The first were also attractive, but the checker pattern on the heel, put me off from choosing them. It seems to detract from their versatility, and general appeal. Shoe #2 give off a frumpy, schoolgirl affect, in my mind. Speaking of my mind, you haven't seen it have you? I seem to have misplaced it.
I would go with #2 because they seem to offer the most support, and the outside material will be easier to keep clean while walking to and from office to transportation than #3 which I find the other visually most appealing for the office and in terms of versatility. However, I am of the opinion spending more on a neutral shoe will save you money in the long run, because cheap heels are made of synthetic material which is often bad for your feet, their heals wear down quicker because it is made of cheap materials and thus need to be replaced more often while easily damaging your feet. If you take care of your heals by only wearing them at the office and not walking in them outside, and just invest in a good quality pair of shoes they can last you a few years, these I don't see you making last more than 6 months if you are going to be using them a lot.
I actually think 3 will be the most comfortable if you're going to be standing for long periods of time since the heal is wider and more chunky, but 2 is the most fashion forward of the three in my opinion.
You should go for the comfiest, but if they are all comfy and your relying on us for the best I think... the third pair definitely look the best. I kinda agree with palek but I like the checker pattern on the heel, but the straps don't seem quite right with it... I dunno, that could just be me... ^^
I forgot to mention that sometimes it pays to spend more money. If you buy a higher quality ( i.e. more expensive) pair of heels, the performance and comfort of the shoe is apparent. I can tell a major difference between my payless heels versus my Steve Madden or Marc Fisher ones (2 of my fave brands for heels!). Most types of shoes don't really matter, but when it comes to heels, it's all about quality.
i would wear the 1st link one but the 2nd link one looks more comfee if your going to stand for a long time...if I was you I would bring a slipper and take my shoe off and put my slippers on when I get to work