I think that visiting a show and not getting a booth is the best option. As was mentioned in an earlier post it would be great if you could arrange meetings at the show. I have never found trade shows to be very beneficial. However, when I did not display I actually made some good contacts because I could move around and check out all the booths.
As other posts have shared, I think visiting the tradeshow would be your best bet. A lot of great networking comes with walking around and talking with those exhibiting. You might even pick up a few leads. Also, it saves you money on the booth cost which can be pricey and can also help you decide if the show would be the best for your product.
On another note, when you have your product ready, exhibiting is a great way to market your product. It is important to find the right show that is why visiting your prospective shows is a great idea!
If you need any additional help or have other questions. Please feel free to contact me. I would be more than happy to help!