Any of the VS pumps will work with your setup but the VF is about $300 more than the VS with little benefit unless you really have to have the variable flow feature.

But probably the most important factor is if you have a controller and which pump it will interface with.

If you don't have a controller, probably the best is the Intelliflo VS 011018 which sells for around $900 and has a built in timer.

But with spa, maybe you want the SVRS feature? All manufactures have a version with that.