Hey dude. I would definitely recommend you do some research FIRST. Just understand that Roland, Graphtec, Summa and few others are very high end, and will last practically forever.
I'll tell you my story, because I have nothing better to do. I was 14, and extremely interested in "stickers." I helped a friend on a softball league scoreboard project. I did my plotter research by reading online, and going to my local supplier. (Ordway). I learned that roland was the "best." I did my research on eBay and found a Roland PNC-1100 for $499! I insured my parents it would be a wise investment, and they let me take the 500 out of my bank account to purchase it. I used it in my 10th grade year of high school. I made about $2000 in one year just by word of mouth, selling stickers to kids at my school. I carried around a book of designs and sold all day long. I took my money that I made and invested in another plotter that a friend had for sale. A Roland PNC-960. I was a little cleaner and it seemed to go faster. I moved on from the one-off stickers, and went into the actual sign/graphics stuff. I sold the 1100 to a good friend who paints murals for a living. He still uses it to this day. A year and $15000 later, I purchased a brand new Mamiki 30." I use the Roland 960 to cut window tint, and the Mamiki for vinyl. In the years I have been in business, I have purchased three plotter blades, and one cutting strip. All of my machines have had ZERO problems. (Problems meaning mechanical; not user-created lol)
There's your research.