My suggestion to you would be to concentrate on learning your software, designing and marketing. Instead of starting out with a printer, plotter and an inventory of materials, look for a wholesale producer to outsource the production to. Once you have built a track record on successfully pleasing clients and have a better idea what they will want, then look again at what hardware is available that will best suit your needs.
To start up a new business with no customers but a big investment in equipment and supplies is putting the cart in front of the horse. Your business is about you and your ability to sell and deliver signs and graphics that clients are pleased with. Having the ability to produce the work in-house is great but is not necessary for you to start successfully. Start your business with a good computer and good software. Buy the expensive stuff from profits instead of going in the hole in the beginning.
Way to go CJ! Two posts and you've already identified yourself as just another racecar driver with a bad attitude.!
You The Man!
Dude, Fast Fred up there just gave you, by far, the best advice you'll probably ever get. Running out and buying a bunch of equipment that just think you need is a recipe for disaster in any small business. If you break down the profit on jobs you'll need to make and honestly look at the print cost (including machine cost, maintenance, learning curve, etc.) it won't take you long the HUGE amount of square footage you'll have to print to make it more profitable than subbing it out to wholesalers who print for almost the same price you'll pay to do it yourself. My shop will do close to $400,000 in sales this year (all sales, not just printing)...we crossed that line for the first year ever this year. I'm still planning on subbing everything out until we can pay cash for a flatbed.
Slow down, sub it out and develop your market. When you see what kind of business you're actually going to be able to bring in with your level of talent the choice of equipment to buy will be obvious to you.