I thought those little Cricut machines were made for scrap-booking and such. I peeked at their website and it looks like they want another $70 for software to plot from a PC with those?!?
My first cutter was a Roland STX-8 that I bought gently used for $200. It accepts 12" vinyl, it's very accurate and quiet. Great starter machine. Even came with plotting/design software. Good o' Dr. STIKA
I recently upgraded to a larger machine but didn't have the money to buy what I would consider a professional machine such as Roland, Graphtec, Summa, etc.
I ended up getting a US Cutter MH-871 on eBay for about $375. It cuts up to 33" wide vinyl and so far it does what I need it to do. It is quite noisy, has accuracy issues (slightly rounds off 90º corner cuts), and the motherboard has been zapped once so far by static discharge. Luckily I was able to get someone on the phone to send me a replacement board under warranty. The cheaper units like mine use stepper instead of servo motors which is the main reason for my accuracy and noise level complaints about the machine. But, for the price and what I use it for it's better than being limited to 12" rolls of vinyl on the little STX-8.