I'd take a melta-gun over a plasma-gun personally and go with the MC Plasma pistol for the Serge. That way your forced to get up nice and close to be effective but when you are, just watch that metal melt.
I'm a little hazy on current vechile rules so somebody please confirm. If you can fire those Lascannons on the Razor while moving at full speed I'd take the Razorback. However if you can't when moving at full speed I'd take the Rhino as if you buy those Lascannons you want to be using them as much as possible and if you moving the entire time and can't shoot its quite a large waste of points.
I'm a little hazy on current vechile rules so somebody please confirm. If you can fire those Lascannons on the Razor while moving at full speed I'd take the Razorback. However if you can't when moving at full speed I'd take the Rhino as if you buy those Lascannons you want to be using them as much as possible and if you moving the entire time and can't shoot its quite a large waste of points.