I agree with the others. Two speed pump is more than highly preferred over a signle speed and would serve your needs well.
The VS pump even though not required and probably wouldnt save you any noticeable $ on your light bill, do have some nice features though. Such as built in freeze protection, timer, ability to schedule RPMs and on an off times multiple times a day. Basically, eliminating the need for an external pump timer w/ freeze protection, which you would need with either a 1 or 2 speed pump. And quiet. I have to sneak up on mine to even know its running! So, there may be some value in those types of features. Just come down to personal preference and $.
On the downside though, the Drives on the VS pumps don't like power surges, so a surge protection would be highly recommended. It will be expensive to get a VS pump repaired or replaced should something go wrong with it.