Geez I used to really like that site too.
I can think of a few things to say about why not to get a Nexus 5 but support definitely isn't one of them. Google has been amazing when I had an issue. They don't have a physical store like Apple but they had a brand new phone I my hand the next day.
Yeah loving my 6 so far but I would prolly go back to a smaller screen if given the chance in two years. Maybe that will change by then but I am still adjusting to it ATM.
I want to say that I almost want to guarantee you that you won't feel that way in 2 years. I can see you thinking that if you bought the 6 plus since I don't think 5.5's are for everyone, but the 6 is really about the perfect size to still provide a large screen and not being too huge for most people.
I cringe every time I had to go and use someone's iPhone 4 or something of the sort. It really feels so cramped and unnatural to me now.