To be fair
@Marvello - yes you did pay that for the table off me. HOWEVER - since then the prices have gone up across the board. A particularly nice one sold for £4,000 a month ago that was made by another member, and I just sold a full size cab for just under £2,500. So yours was a particular bargain, and I sold it for the bare bones price of what the parts cost me as I wanted to fund another table. In the future a build like this would be getting on for £2K as I particularly like the 'Ultrapin' cabs. I know of 4 more in the UK and the owners are not willing to let the cabs go for silly money so I can not see me doing another.
Having considered building these machines on a commercial basis - you have to consider that a decently made cab with all the hardware, legs, coin door, decals etc will cost you approx £1K. Then you need to add screens, and spend approx £700-1200 on a PC. Let alone the other electronic parts. Add another £200-300 if you want forced feedback. Speakers and amps - add another £100. Plus commercially I would want to make some money.
A lot of work is involved with building one of these. Especially if you built the cab from scratch.
As
@ChrisH states - you can save money using used products. In fact I would recommend:
i3 or i5 or 3.6GHZ (3rd generation or above)
GTX1050TI graphic card (up to 1080, it wont do 4K)
8GB minimum ram.
Use a motherboard that is DDR4 if possible, DDR3 will work fine but allow a bit for future proof.
Visual pinball is more GPU than CPU. I have had it all working on a 3GHZ i3 but with a real good graphic card.
A GTX of lower spec will work but not at full settings.
@Chrish10 - this is more of a REAL pinball forum, I am sure I get people tutting everytime I mention visual pinballs - but go onto facebook or the www as plenty of groups exist to help out (as I will also help you out). If you want some more info feel free to PM me.