If you play at higher resolutions with high details turned on, the SE might be worth looking at. From the article Snipergod linked:
"Performance numbers for this new SE card were interesting to say the least. At lower resolutions without AA enabled, it really doesn’t compare all that favorably to the similarly priced GTX 460 768MB. Once higher resolutions and image quality settings are used, the GTX 460 SE’s larger memory bandwidth can come into play and it begins to pull out ahead of the 768MB version – at times by significant amounts. It never does come close to matching the GTX 460 1GB but then again, it was never meant to."