Replacing them with modern caps of the same values will give you better reliability because modern caps are greatly superior to those made 60 years ago. This article has lots of information about choosing replacement capacitors:
http://antiqueradio.org/recap.htm
I normally choose replacement caps with the same capacitance values and voltage ratings as the originals. There is no real advantage to using caps with a higher voltage rating than the originals. Higher-voltage caps will be larger and they will cost more, but otherwise your TV will perform the same either way.
Some folks make sure that new electrolytic caps have a good maximum temperature rating -- say, 105 C or higher.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html