Graham,
A lathe is a compromise of options.
If it's big bowls you want to turn, then something like the VB36 is your goal, if it's long Spindles then a long bed is needed. A big motor is great, but if all you turn is pens do you need it?
As for worrying about lining the headstock up with the tailstock, eh... why? You can offset a head by several degrees and still turn a smooth cylinder, it will be rotating between two points. The only time it's important is for drilling exact holes, but lathes now-a-days come with a positive locking arrangement to ensure that the heasdtock is positioned correctly to the lathe bed.