I bought a Shark Steam Mop about 6 months ago (also at Kohl's on sale plus a coupon), and I love it!!! It works great, has plenty of steam capacity and its no big deal to refill if needed. My floors have never looked so good, and I feel better knowing my DD and the kids I watch aren't crawling though chemicals and germs! I also bought extra pads which is a good idea. I wish the cord was a little longer, but I just plug mine into an extension cord. I read all the reviews before purchasing mine too trying to figure out what brand was best and I was a little hesitant but it has been great!
A friend of mine bought the H2O mop, loves it, but says the company has terrible customer service (if you buy from the infomercial)
There are some cheaper brands I have seen too. My best advice is to buy from a stores so if you have any problems...