The ST line is lower than the GT for the 50 series. However, the 2013 model line in the States is S, ST, VT, ZT. There is no GT this year. The ST60 is being compared favorably to the top-of-the line VT50 from last year should tell you all you need to know. The only thing I would caution you on is the ST60 has input lag that is noticeable to some people and has a thread in the forums. I purchased a 50ST60 as a "temporary" TV until the ZT series came out... Three weeks on and I am still constantly amazed at the value you get in this set.
Thank you for the response.. Sounds like a no brainer. Just looked at my receipt and the ST is $200 less than what I paid for the GT, and it comes with the 3D glasses.