There are several on-line calculators available that does a better job than merely looking at your overall height. You'll have to do a search, i don't have the links available on this device. Wrenchscience or so I think was one of them. It's fairly important to get drop- or flat bar bike right, as converting from one to the other can be a lot more hassle than you might think. I don't have much preference as such when it comes to brands, particularly for whole bikes. Shimano stuff is often less expensive and easier to get hold of than Campagnolo stuff. Not all people can make good use of a drop bar, while anyone can find a flat bar bike useful.