I have a Galaxy SL. I speak with personal experience... Please don't buy it.
Go for Desire S.
why not Galaxy SL ?
Buggy firmware. Has become quite sluggish after using merely a week. Samsung Kies is an awful piece of garbage which is bundled with this phone.
To get away from the crap that Touchwiz is, I installed ADW Ex launcher. But the phone has become so sluggish. My Optimus One is faster...
Apps force close many times. Everytime I uninstall some app, the App Manager crashes.
Samsung cannot make software. Just cannot. They have ruined a perfectly decent hardware with their crap touchwiz. If only I could install stock Gingerbread on my baby... it would make a ton of difference.
I'm getting at 21K....with amoled.