Buy a cheaper SS machine fully working in well cleaned & repaired condition at a "fair" price. As stated above look the machine over closely for lazy cleaning or hacked boards & battery damage.
The logic behind buying a cheaper title is you will not be as afraid to work on it when something goes wrong. (You notice I didn't say "if something goes wrong") If you own pinball machines you will be fixing them or paying someone to do it!
Don't worry about getting something you love as your first machine - you will have plenty of time for that when you buy the second & third in a few weeks. Get a good quality "starter" machine" enjoy owning it and learning from your mistakes then go after more expensive titles. As the seller of the first machine we bought warned us "you will never stop with just one".