Water softener ???

I am having problems with a Culligan Mark 89. I have already replaced the eductor and a rubber seal on the valve assembly. when going in to manual regeneration it will go into backwash and then refill but after that it does nothing. My dishes are still covered in calcium. I have also spent 3 hours on here reading and checking for other solutions. IE the float assembly the line has got suction. My question is would it be more which is the best route to go:

1. Call Culligan and see if they can fix this unit for less than 300.00

2. Purchase a new Culligan unit for 1800-2500. This is a lot of money.

3. Or go ahead and replace this whole system with a Fleck 5600 SXT system for around 700.00 installed.

Trying to make a wise decision i am still in sticker shock with the prices the Culling guy gave me for a new system and i want to make a good choice since the wife still wants a new front door and a remodel on a bathroom.

Any advise or path to follow would be greatly appreciated. Thanks David