I think you're already well on your way.
15 services + options is a lot and I think your mockup is already pretty clear.
It's hard to circumvent the issue that it will be quite a list.
To add on this concept I would advice some sort of counter that keeps track of the price /hour with every option selected.
With the starting amount of €12/hour and two options +€1/hour each, the counter would say €14/hour.
I don't know if this is at all possible, but you could turn it all the way around and instead of providing solutions for the visitor to decide which fits best with their problem, you could let the visitor select their problem and provide them with the fitting solution.
Perhaps there are fewer problems then there are solutions (services).
Problem/need: "I need a radio commercial"
Solution: Service #1 and Service #3