If you really want to enjoy a Super Nintendo to the fullest extent, then you don't want to play it on a widescreen display anyways. What you really want is a Sony BVM -20F1U.
You want the pure, natural, analog RGB output of the SNES going to a monitor that can display every possible pixel in the utmost detail and clarity. You want incredible color accuracy and black levels. These monitors were used in TV production studios, and professional video editing studios, etc, etc. Back when they originally were released, you'd see these things sell for $12,000.00 . No joke. You can find them on Ebay between $100 and $2000, but the thing is, you need to make sure to get one that was made more recently. They made this model all the way back in the mid and late 1990's. You want one from 2003, 2004, 2005 or 2006 if possible. Also, you'd like to find one with 20,000 hours or less on it. Hopefully no burn in, or anything like that.
A friend of mine has one of these, and he plays his Super Nintendo and Genesis and all those consoles in RGB on it. It's absolutely DROP DEAD gorgeous. I've never seen Super Nintendo or Turbrografx games look so good. His was made in 2003 and only had like 14,000 hours on it. He paid $250 for it.