I posed the same question a while back:
http://smith-wessonforum.com/lounge/...ning-help.html

I ended up buying a Lansky 5-stone kit.
Once you get the hang of it, it puts a very nice edge on the blade. I'm very happy with it.
I use a sharpening steel to tune up the edges in between sharpening.

The kit I bought is kit number "LKCLX" at Lansky dot com.
The website shows the kit for $49.99, I bought mine locally for $44.99.