Hmm, that's strange. Normally the low voltage capacitors on the secondary side are more likely to die before the high voltage capacitor(s). As for which brand you should go with, I think a Samxon would do the job since it normally won't put too much pressure on the primary capacitors.
btw. I'm not qualified to answer caps related questions. lol. Let's wait to see what c_hegge would suggests.
Please feel free to point out any mistakes in my messages. That will be helpful for me to make less mistakes in the future.
Any help will be appreciated.