Most of my experience is with Shadowrun 3rd Edition. Obviously this is kind of obsolete now. I've never touched 4th Edition, and I've heard mixed reviews, but I'm not sure what people's general feelings on it are. I'd also be willing to try a new system - there isn't any real majority of people-that-know-systems (we've got one guy who knows a bit of D&D, one who knows a bit of World of Darkness, and stuff like that) so we'll be starting from near-zero whatever we do.
So, two fundamental questions:
* What's the general opinion of Shadowrun 4th Edition? Good? Bad?
* What other systems with a similar genre (since that seems to be what we want) should I take a look at? I'm perfectly willing to spend an hour thumbing through books in the game shop, I'm just not sure where to start.