Any of the plugins will give you Surround Sound if you are outputting to a Dolby Prologic/Prologic II compatible receiver. I don't believe there is any way to get surround sound from just your computer and some PC speakers unless they have some sort of Dolby Prologic decoder built in. Dolby Prologic is basically simulated surround sound where the stereo source is split by frequency and sent into different speakers it's not a digital system where different sounds have there own dedicated channel.
Any game that's designed to do this will work even in the majority of plugins and emulators I have tried. It's amazing how many SNES games have surround sound, it's pretty funky to play them. Super Turrican 1+2 the sound corresponds to where you are on the screen. If your on the left the FX are in the left speaker, center of the screen you will hear in the center speaker, and right of the screen you will hear in the right speaker.
*A lot of games have the capability of surround sound but didn't pay for the Dolby license so they won't say "Dolby Surround" on the game or title screen but will in fact have surround sound. Most N64 and SNES games do infact have some decent form of surround sound, sometimes it is a little difficult at first to tell if they don't have it because Dolby Prologic will create Surround Sound out of any stereo source whether it was made for it or not. You will be able to tell if a game was designed for playing on a surround sound system though because it will sound much better.