I don't know the MID code of those smartbuy ruco -8x. If you know that code,it'll tell who actually made them. Here's some of the manufacturers for some of their media:
Those verbs have Metal Azo dye,and should be the best of that bunch. You should get them cheaper than that $32 a 100 pack tub.
Supermedia store has them,but a $25 rebate. Check them out.
Rima.com also has some quality verbs and riteks.
Meritline.com is also another great choice.
With those prices of 28-30 cents each,without shipping: I'd get the dash 8x taiyo yudens. You may be able to find the shiny thermal printables well below that price. These will code as Ty-g02 and also feature the metal azo dye.
Another member just posted newegg.com as selling fake tys to him,so avoid their ty media.Try those other stores I listed.
It should handle those ty-go2s.Very-very slim chance of a firmware update for your nec to handle them.
Some of those stores may list 4x ty,but you may get 8x ty. Still excellent, high quality media. With all the horror stories I am hearing about those Ritek-g05's,I'd go with the tys. It's getting very difficult to find the quality 4x ty-g01 media.