Where are you located at? I would suggest you go to a
sign show and look at a few equipments to get an idea. This is a great place to start at (
THE NBM SHOW | Expand Your Cross Market Opportunities)
You have to decide on what's your realistic budget would be ($10k, $20k, $30k investments). Sure you want the best of the best, but you got to decide on what you want to get into, or what your customer needs are. Do you want to make small decals or do a whole vehicle wrap? A bigger machine will also take up more space.
I do mostly small decals so I dont need to spend too much on a machine that would take a long time to pay off. Since I bought a Roland BN20 Print/Cut, I never turn on my old 24 inch Cutter anymore ... I can print anything up to 20 Inch Wide, Decals, Banners, Etc ... I paid cash for my machine out right, so I dont have to make payments to a financial banker each month. That means I can make money when we are busy, and I dont have to stress when the season is slow or when you are just starting out with no customers to pay the bills yet.
Buying any equipment is like buying a car. Do you sleep better at night know that you spent $10k? $20k? $30k? and you owe money, and how much can you afford the monthly payments?