Choosing the "right" template

So far it has been hard for me to pick a template that I like the most. Out of all available, two of them really stands out: No. 565 (by Bowman) and TicTac Blue (by Cederholm). Though the font size used in the former is smaller, somehow it feels easier on the eyes than the latter. Not sure why either, but I suspect it must be something to do with the line height. If I really feel an urge to go for TicTac Blue, I will probably have to google for online resource on how I might go about modifying my CSS file for that.