I bought mine in october of last year. The Sony XBR-X800D. But if I was to buy one right now, based on a similar budget I allowed myself to spend last year, I'd most likely go for this:
http://www.rtings.com/tv/reviews/sony/x900e
Which is offered in the 49", 55", 65" and 75" brackets.
As for the PS4 Pro upgrade being worthwhile or not, I'd say it depends on the games you play. Horizon, GTS and FF XV, three games I play, all look phenomenal in Pro mode. Especially Horizon, with its unmatched use of 4k checkerboard, and a HDR implementation second only to GTS.
I see quite a difference between 1080p games and games that have a resolution boost via their Pro patch. And I wish all games would have that kind of added picture quality. I play Persona 5 right now, and while it still looks quite good thanks to its bombastic visual style, there are a lot of jaggies.
The Pro isn't a game changer, and isn't necessary depending on your gaming needs, but I do enjoy the added picture fidelity as well as the performance boost it provides for some games. There are more and more games making use of the added horsepower of the Pro, and with The Last of Us 2 coming out eventually, I'll be set to enjoy it the way it was meant to be experienced. 
