Nikon D40 - slave flash units?

As a college student I'm limited on budget for better photography equipment. I currently have a Nikon D40 with the SB600 external flash. I was wondering if these following items would be sufficient to remotely trigger my external flash with the D40.

http://cgi.ebay.com/...2c56264b24

and a Yongnuo Speedlight YN460 II slave flash unit.

I would certainly prefer a SB900 and a pocket wizard over these items but I'm on a limited budget. Will there be anything else that I would need for these items? Other than the obvious for light stands and diffusers. And any other advice and suggestions are certainly helpful. Thank you!

Added (1). Or http://www.amazon.com/...0046HGYQ2/

or

http://www.amazon.com/...002W3IXZW/

would these items work with my camera and sb600?

I don't know about those other brand items, but the Nikon SU-800 can be mounted on your D40 to trigger the SB-600.

http://www.bhphotovideo.com/...ander.html

Yes, or any flashgun, as long as it can be set to "slave"