Which particle to use?

Canluum

Hey there!
So having a little trouble understanding the particle usage in this sentence "won't (you) have dinner tonight?" Is it: (romaji in spoiler)

今晩晩御飯を食べませんか。

konban bangohan o tabemasen ka

or
今晩晩御飯は食べませんか。

konban bangohan wa tabemasen ka.

I would have thought を was the appropriate particle since it's a verb and the topic is implied... but I'm almost certain the guy on my pimsleur audiotape is saying は. I googled parts of both sentences and they seem to be equally prevalent. If they're both correct on some level, what's the difference in emphasis or meaning?

hibby

Disclaimer: I don't speak Japanese well enough to have a good "feel" for the nuances of meaning in a case like this.

Both are correct sentences. Both work as invitations with essentially the same meaning. Furthermore, in normal speech you could say it without any particle at all: 晩御飯食べませんか.

What's the difference? I'm on shaky ground here and will welcome correction by someone who speaks better. But, here's my take:

"o" in this case means "Shall we have dinner?" whereas "wa" means "How about dinner, shall we have some?"

You could even shorten the sentence to "晩御飯は？" - how about dinner?

kawaii

Japanese usually try to insert は into negative sentences at least once.