The silver has a metallic finish to it (little sparkles, don't know if it's the "annoying" dots you're talking about, I think it is though).
It is a new Slim and Lite.
Those are all good accessories, I have a car charger but I never use it, so I don't think it's all that useful, but you might use it more. I'd also suggest getting a nice soft cloth for cleaning it.
As far as hacking your PSP I'm guessing you mean custom firmware, in that case just look at the stickies in the homebrew section on this forum. That would be a great place to start.
Hope this helps.
__________________
|