I think that you may want to define what tone the amp will be used to achieve, or to specify that you mean best over-all. If that's the case, I would suggest the Mesa Boogie Mark IV as being best over-all.
Out of that list, I'll go with the Laney just because you can get a lot of cool tones out of it.
Laneys are pretty cool amps and they don't sound too bad.
They are a little more open ended as opposed to Mesas or Marshall--which are very one sided, one trick horses.
I agree with the sentiments about Mesa. Great amps, but the Rectifier is probably not the best choice from them. I like the more flexible ones like the Mark IV or Nomads.