JJ 300 B tubes or others ?

Hi, Folks,

I'm looking for a pair of 300 B's for my ANK Kit 1 amp, something that'll be a step (or two) up from the stock Shuguang's that came with the kit.

How are the JJ 300 B's from Slovakia? I've seen them at good prices. Any other suggestions? Let's say the budget is $300 or less.

Thanks!