I love Van Halen, they're my favorite band. If you're a new fan, pick up the 2CD best of (Best of Both Worlds). It has all the essential Hagar/Roth tunes, so it's a good introduction. There are only 2 essential tunes missing from that set: Mean Street (Roth) and Humans Being (Hagar).

I prefer Hagar's voice, but prefer the guitar work during the Roth era.

It's highly unlikely that they will ever tour again, I was fortunate to catch their last tour with Hagar before it all imploded. Great shows. Eddie is a genious but he's hard to get along with. And Hagar is probably easier to get along with compared to Roth. So don't count your breath on reunions.