Try them both and see which one fits you better for the price..

lots of people say different things

"GSR is not that much better than an LS"
"no comparison between the GSR and the LS"
"for the difference you can turbo your LS"

really, it all depends on the buyer end of story. Not everyone wants to deal with maintaining and installing a turbo.. Not everyone wants to rev above 6,000rpm durring daily driving, not everyone wants to mod their car, etc

From my driving experiances with LS,GSR there is a noticable difference, especially above 6k.. but its often overstated. The extra performance is nice, and reving high is lots fun, but you are basicly talking about half a second difference in the quarter mile.

Its hard to get good opinions from a messageboard like this, because GSR owners want to feel like they made the right choice in spending the extra money for the performance, and the LS owners want to feel like they have a good car even if they don't have the more powerful engine.

Either way you pick a good car, both cars have great performance for the price. The GSR costs more and performs better.. the LS costs less and performs less.