wavemaker question again.

[ickmagnet]

Sorry, I know I asked something similair before but now I'm moving into buying stage. I bought my current tank (see pic) before I knew anything about salt water. I believe it is built in China or something. Hopefully someone can recognize the brand. Anyways, it serves my purposes well but doesn't have a sump/overflow system (yes, I know I have to hide that pump somewhere).

It is 5 ft wide and approx 135 gallon. I don't know whether to get a tunze nano wavebox or a tunze 6212 wavebox.

I like the nano because it will be easier to hide but I'm worried it might not be powerful enough. Also, I'm worried that the 6212 might cause my China made tank to fall apart. Any suggestions?